Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afa10c8f7c38576…

MALICIOUS

PDF

67.6 KB Created: 2021-03-14 19:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a72a5146414ef15edbf20aceb763c060 SHA-1: 10d0f3c8f3af7fee27c532b5e17c2e9349523f1e SHA-256: 4afa10c8f7c38576822ca47e75d92e8ee081315c824ad149b6694e933296948b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=panasonic+tc-p42x3x+conectar+a+internet PDF link annotation
    • https://cdn.sqhk.co/merabuvi/ifHigij/72140273456.pdfIn PDF document text
    • http://steelsho3.club/183827296iaup6.pdfIn PDF document text
    • http://ruwakus.22web.org/janapada_geete_madi.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/ij7pji1/green_color_splash_white_background.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/cjfzjg9/83651442318.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/lds_temple_prep_lesson_1ci0vm.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jgdjije/nike_10k_icon_clash_shorts_pink.pdfIn PDF document text
    • http://setobow.22web.org/african_swine_fever_vaccine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wirirarosutuki.epizy.com/herblore_guide_rs3_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfa6902-c7af-45bf-8149-a55b8a971346/63539614271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b45847-b5a5-456f-811e-54751bd84cf5/osha_10_construction_training_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e55b9f9-94a1-4528-8023-22972077ffa9/5660088812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfc1760-ba1e-4d6c-ace4-7abcef4c8e74/what_is_the_value_of_cos_60_degrees_in_fraction.pdfIn PDF document text
    • http://rikovaniroxatox.rf.gd/aptis_test_sample_questions_and_answers.pdfIn PDF document text
    • http://ligifufeg.rf.gd/machine_learning_algorithms_free.pdfIn PDF document text
    • http://kololujes.rf.gd/ethics_integrity_and_aptitude_book_in_hindi_download.pdfIn PDF document text
    • http://sanupivoxenano.epizy.com/what_is_the_meaning_of_thermal_conductivity_in_tamil.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_0534a5fdd387480c8aed7f8d86cf6766.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_off0000c82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 5380 bytes
SHA-256: 6e28f9d92a7b5d55019afd556b2b41dbdf14b8390c5d84d0854e009dd784796d
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 11348 bytes
SHA-256: 6b01e84d51f14644ab19bdd089eceaa74ffa3caf1be7ee3659e3ec3304a9d379

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