Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd5d302ca04ab0d…

MALICIOUS

PDF

76.5 KB Created: 2021-04-01 22:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4802dc8251341be508e227c466eb118c SHA-1: dfa95853e72140d3f55df01cbfe3d92e0e445f76 SHA-256: 4dd5d302ca04ab0d3fbc7c17fb4052a2e6d6791cf387d87aba7d163a9542af18
186 Risk Score

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 0.9993

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://dugedepap.ru/123?utm_term=brawl+stars+apk+apk+cenneti PDF link annotation
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/kunidofejo-jekeju-gukerijevuvoso.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/GhdJcie/lexolumusanu.pdfIn PDF document text
    • https://mixasokuxorizu.weebly.com/uploads/1/3/4/7/134742222/sizalenobakodudejiru.pdfIn PDF document text
    • http://mopovigegof.22web.org/contoh_abstrak_skripsi_bahasa_inggris.pdfIn PDF document text
    • https://mufudenufasos.weebly.com/uploads/1/3/4/4/134492520/214a9828df6.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/yhdogeU/25754174978.pdfIn PDF document text
    • https://bivofeneduwid.weebly.com/uploads/1/3/1/1/131163561/4d8fc20a.pdfIn PDF document text
    • http://interbank.link/interceptor_missile_meaning_in_bengalim9o9b.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/jiLK9ih/labezifisin.pdfIn PDF document text
    • http://hiziryigit.online/deepak_chopra_21_day_meditationimsf2.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/IFhaji0/66569754297.pdfIn PDF document text
    • https://cdn.sqhk.co/demawanetufi/vghgije/word_of_the_day_bible_catholic.pdfIn PDF document text
    • https://pujuxuzanebov.weebly.com/uploads/1/3/5/3/135351243/8242153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8094dced-10f6-4a7f-9b99-f5d9a2803455/dobemoxaxumunovuzibogaso.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_dbb7a93d65f140eeb142e87306b0004a.pdf?index=trueIn PDF document text
    • http://vegunag.rf.gd/scholarship_letter_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0feaba-02d9-4250-acdf-f26f2ac29210/olympus_om_lens_lineup.pdfIn PDF document text
    • http://gofeneneju.rf.gd/chicago_manual_of_style_bibliographic_citation.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_5813dbdf49ee4a19b61da79aa9749863.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61105f78-936a-4bf5-a5b7-d531a2483f33/how_to_file_a_ucc-1_in_delaware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3cd9789-9efe-406d-811c-1d414ff0b998/80688338275.pdfIn PDF document text
    • http://dawutanarav.epizy.com/sandisk_clip_sport_plus_not_turning_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecefd018-2f3b-4609-8ecd-baf4fe8e204d/how_often_does_usps_get_paid.pdfIn 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_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 5132 bytes
SHA-256: 295f1d0bfbc414e68a42df4b87a1f57f97add09c648d997b1055a9f276fb0795
font_01_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 11740 bytes
SHA-256: e270865ece83a34914b462eaab4c901d3d383ab23941281e4096bf5a5ade6ad1