Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb685616706e775…

MALICIOUS

PDF

116.8 KB Created: 2021-04-03 11:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7fdc9d866423d0b1ae8c3edac4e3d7d9 SHA-1: 049fb984a2f9e07661108d7254f86a6b54b04a56 SHA-256: ddb685616706e77540da41ff49ae7c86cde68163d7f4a711cca88c6643bd1174
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/123?utm_term=age+of+empires+definitive+edition++steam PDF link annotation
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/3444969.pdfIn PDF document text
    • https://wigitofeza.weebly.com/uploads/1/3/2/6/132682623/c024787cc73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_6068141849106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_604327e820fbd.pdfIn PDF document text
    • https://vexigijetizi.weebly.com/uploads/1/3/4/7/134771524/fupoviw.pdfIn PDF document text
    • https://luzibajaxu.weebly.com/uploads/1/3/2/6/132695572/kefujaburesos_raman_zilaturaxapufiz_sajefabajubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_6049a4e33f5a7.pdfIn PDF document text
    • http://xajoraxi.22web.org/bafamivuzutilagibaxok.pdfIn PDF document text
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/ea12afe69d.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/1164870671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_5fe750a5d88d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_6059ac9e843bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fd171766d6c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_602c4fab4c458.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/c75ab7d6-2c95-421b-b7e8-bca2336f3674/xebibixowaje.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/a_dozen_a_day_book_1.pdfIn PDF document text
    • http://junixaz.epizy.com/padi_advanced_open_water_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6f6666-9a80-4174-9cd3-0d8577e8c11c/delonghi_magnifica_4110_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6b6a48-cca8-4acd-ac10-25f7b80c963d/learn_english_with_tv_series_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/best_english_grammar_book_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02720dbe-d8e9-461c-a7e4-2aae9fc729f4/59562152695.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1E 5376 bytes
SHA-256: a6e448d7a788302998e1a8e5613e2364266406a9c9521349014b8141175f23d2
font_01_sfnt_off00017e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E59 1984 bytes
SHA-256: 6b77f015d75589339f99951b3e845d61125308916dc85756c3c068af0eb4b1af
font_02_sfnt_off000187c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C9 11656 bytes
SHA-256: d7a730e95e70b7e1986f6c3fbb5fd9cfac7aa8bb47eca33e65a5fcbcd0722cba
font_03_sfnt_off0001afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFC8 16212 bytes
SHA-256: efa10eb016e3f3b0b4b9ca88735192a2169c3e2ea1838fdfae102cdad0ae9fb6

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