Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc558d25fae4adc9…

MALICIOUS

PDF

109.0 KB Created: 2021-04-07 10:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 314a634908326a17f06769b987b824c3 SHA-1: 73420dde203117892e619c4f0d4788f155af02cd SHA-256: cc558d25fae4adc9ecac1f7ebe6d243a20334efb7d27aeb73a9ad54d2f57cee0
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://golowaki.ru/strik?utm_term=jam+-+chill+out+portable+bluetooth+speaker+-+gray PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368748/normal_60419c37b0b2e.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/1d202315f87.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/5023612.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/vudalaranejagudugum.pdfIn PDF document text
    • https://pekijazezob.weebly.com/uploads/1/3/1/4/131407278/maluvipawufetumesoni.pdfIn PDF document text
    • http://uspex22.online/nekagozenobonuzekoka9hkd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_6041cb34cbd9f.pdfIn PDF document text
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/giwapekefi.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/1dbf5d2.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/9048c5.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/guitar_tabs_book_free9ycxf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482671/normal_600f23bc6dd29.pdfIn PDF document text
    • https://dinurafilaxu.weebly.com/uploads/1/3/4/6/134621410/99d8038bd8645f0.pdfIn PDF document text
    • http://electorat.org/lewupukoliwunezenepuxorujeje.pdfIn PDF document text
    • https://fegenogo.weebly.com/uploads/1/3/5/9/135981842/69214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_602c744ab47ed.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/13984536542.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://uploads.strikinglycdn.com/files/a15802aa-5f37-44b6-90ca-431177ad6e98/40587877209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4bf520-9cba-4968-bf6f-e9e89e03b4a2/how_to_trade_with_pivot_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3cf1ace-5624-4b59-8d9f-e82388cf1649/vajulonef.pdfIn PDF document text
    • http://sufixis.myartsonline.com/zumiwepevugapenaminuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b4118e-9e7c-4ba8-90af-4ea8d616b7b1/storyboard_free_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9267ba0-a20c-49c2-bf34-a75f2fea5eda/gulinegawurobebusa.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_off00015e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E81 5448 bytes
SHA-256: ccb8a43365e36bb9fafa990cb55594cabd1bd24ed3d1c990f0c0c92039ffe567
font_01_sfnt_off00017110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17110 11540 bytes
SHA-256: e5384806e2e052075ee4239b6e02a9f2e0510a44040e9d74de98b8aeb1e4b0e4
font_02_sfnt_off0001984d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1984D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2