Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1409f6f5e1fbe02…

MALICIOUS

PDF

90.1 KB Created: 2021-04-15 08:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 166f77f0cb325e63ff970ebbbcf5b45d SHA-1: ca4f12f05d87396830cf64e923c551115768182b SHA-256: c1409f6f5e1fbe02b3e29af40e441cb45d07852c588ae5a3a1ae4739c05bd6cb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, with many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily corrupted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=resumen+de+cien+a%25C3%25B1os+de+soledad+capitulo+4+5+6 PDF link annotation
    • http://m-ryanaf.site/how_much_does_99_crafting_cost_rs332fxi.pdfIn PDF document text
    • http://latencfsrt.space/fundamentals_of_thermodynamics_9th_eox3tg.pdfIn PDF document text
    • http://ita-fitness.fun/i_hope_it_will_be_great_meaning9b78b.pdfIn PDF document text
    • http://samyog.ru/9587705417gs0bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/timituvupame/3d_art_tutorial_step_by_step.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_27df9ffc88184ffb8efcec1862cc2f68.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_728ec169c64d4cb781f5f87c20bdb780.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54a644e-480d-489a-b25a-2c9d8248ecc8/craftsman_laser_trac_combo_kit.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_9c1005ecd4f34384b2098de29508fe53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/3560913987.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/76667481898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89092860-1f6d-4296-bbf9-4649e3448d65/old_school_rap_90s_instrumental_2019.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_b10dd6d76ffe43cf98ff331be100606d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eba7a0d-7ce2-4216-a8ef-bca581b4fc03/40049193300.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_d1c2036c95294756943aa61d7da2f1b3.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_48cdf7551a07455a82fc113bdfeb6f76.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_3f2ea8e6d2f242658f0a3807c7fc23f6.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_22fec17db79244fabf0f8c7c9bce7d95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbc7c0c-908f-4aa0-801f-a0a069479bbb/has_starbucks_changed_their_cup_sizes.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_0ecc7a39212a43b98ed12b1ad1ab28a7.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_2c5459a1b18642a3bd7aff58f574bca6.pdf?index=trueIn PDF document text
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_e33bf96973f747b3a601be554c036f5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/ichalo_nabantu_song.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_8b0409b086b544ddb7fe35841151d390.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/short_funny_non_religious_wedding_ceremony_script.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_4d7e9e925f324034bd9a095442af18ae.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 5708 bytes
SHA-256: 7eee45bd8f7dd2f6a02f7b3bd15bda2e8dd409ef7ff57554d53fcbcf467bdfee
font_01_sfnt_off0001341a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 11088 bytes
SHA-256: 74c44219609288766abb774f418f5782b9c4f6a9f01e4ac4be397578659cdb99

Open this report in the interactive analyzer, or submit your own file for analysis.