Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9da5aff67f163d…

MALICIOUS

PDF

83.7 KB Created: 2021-05-14 19:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 448a8ba7c205b5936938ee12061083aa SHA-1: 32de15ddfa92b1c1443d8da9987448aa3096576c SHA-256: fd9da5aff67f163d2f304e4864294fdc798072d7d734f5be47567e813fd588ac
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, with one prominent URL pointing to 'baarspo.ru'. The PDF's structure suggests it functions as a link farm, likely intended to redirect users to malicious websites for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and the ML/ClamAV detections strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=%25D0%25BD%25D0%25B0%25D1%2583%25D1%2588%25D0%25BD%25D0%25B8%25D0%25BA%25D0%25B8+motorola+verve+buds+100+%25D0%25BE%25D1%2582%25D0%25B7%25D1%258B%25D0%25B2%25D1%258B PDF link annotation
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/6148612.pdfIn PDF document text
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/5914087.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/17cfa6.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/e5AeuZ4/jaxomisufubogamun.pdfIn PDF document text
    • http://sezituza.66ghz.com/gucci_belt_ynw_bslime.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/fabufaxedeg.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/djhY0hj/titan_throne_alliance_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/ZhbZYgc/block_international_calls_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/jjhgdih/online_nec_wire_size_calculator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xamibudasagas/bibure.pdfIn PDF document text
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_692a3f0e8c14459f960ed7f529939d06.pdf?index=trueIn PDF document text
    • http://bibarixe.epizy.com/jawedifuloguvuri.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_7454675b9b0043cdb8e28defe23f5230.pdf?index=trueIn PDF document text
    • http://kuvevaxumo.rf.gd/jifilapibovogozizupapef.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/vunujejejebaxuxasaxule.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_1d9e6ea253ba4ce9b9596dcc634d14e9.pdf?index=trueIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_e07bbeee793a4c24843518cb9604ca80.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_22220cde631f48bb8422d2a956557ae8.pdf?index=trueIn PDF document text
    • http://dapuzuro.epizy.com/28747508910.pdfIn PDF document text
    • http://xegaweripe.epizy.com/cancun_tourist_map.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/71986359775.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 6220 bytes
SHA-256: d4d390dceb15194a86f7d128c105dd97d4ca248160ada82ed2cb69f41477d1c4
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 15896 bytes
SHA-256: 4d95897c5dc6b359f73b89d16f282ee3af21e0240c98365dd6ecdd06efc06634
font_02_sfnt_off0001305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3