Malicious PDF — malware analysis report

Static analysis result for SHA-256 d686c89a29384670…

MALICIOUS

PDF

79.0 KB Created: 2021-03-05 00:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 76f8123551474406c2b44535718c71da SHA-1: 19c9d1fec63d0c42ac0143e1eafa02b9e6c975fb SHA-256: d686c89a29384670b43133798acf09c99e4860a3718964b0c48a3a35866f16c1
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous external links, many hosted on disposable domains, forming a link farm. Heuristics indicate it's a lure for invoices or download buttons, encouraging users to click these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=balanced+literacy+lesson+plan+template PDF link annotation
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/ropevewip.pdfIn PDF document text
    • https://bikubelefa.weebly.com/uploads/1/3/1/6/131606475/33c96d8b718c9a.pdfIn PDF document text
    • https://gedexezesojefib.weebly.com/uploads/1/3/4/6/134666283/0c85a1523b.pdfIn PDF document text
    • https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/8986800.pdfIn PDF document text
    • https://jepunitapo.weebly.com/uploads/1/3/1/0/131070437/7219165.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/0017715fe3.pdfIn PDF document text
    • http://itash.space/exercicios_sobre_cristianismo_judaismo_islamismoqmq0y.pdfIn PDF document text
    • https://mojulikobamod.weebly.com/uploads/1/3/4/4/134488450/gusunipuwuwobus.pdfIn PDF document text
    • http://prizinsta24.online/b_arch_question_papersm0ek.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/1086443.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/7206928.pdfIn PDF document text
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/nunumim.pdfIn PDF document text
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/8914447.pdfIn PDF document text
    • https://vumazilizulorap.weebly.com/uploads/1/3/5/3/135300666/bojamezixawawat-ridabelamaboji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_7134bf9291f54cacb087ae644323e2e0.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_27cc1056a0ea4a97924e67adbe735f7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11322110-1ee7-4fcd-94d0-5313881fe4d0/fishing_gear_at_bass_pro_shop.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_87aee0f037344a11b8658343c9ec6030.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3f946a-0c65-4563-835c-a54281d5d66d/86190323809.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_a4270e1452ef4654b478b8ffcd5fb3f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edf9894-79c7-4d68-a809-d525d3b8ca49/61540823825.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_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 5368 bytes
SHA-256: d34428187611e9a07366c1dff40563d2ea3d6d32ad92c9bccf8cbe55e9477d33
font_01_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 10596 bytes
SHA-256: 34ebc18ce5069d54242f2ecfed84e86a8cebad772e0734d02d23facfa0e2f683

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