Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1939bcb4666dba7…

MALICIOUS

PDF

92.7 KB Created: 2021-03-28 23:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1516d26b9bd3b2810b120f63e669c6af SHA-1: dfc7a067bcf556d159a115bbcbc41fd77a67d719 SHA-256: d1939bcb4666dba7f6d27acfbd7d63942636c3d1aacc3e1986204b19a9af96c5
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 0.9997

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://leonvi.ru/123?utm_term=the+crown+season+3+episode+4+reporter PDF link annotation
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/f80f94db5b695.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/nikavakalumegirur.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/78861347604.pdfIn PDF document text
    • http://nijewogifuzazi.mypressonline.com/problemas_psicosociales_y_ambientales.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/iheE0ND/givamafamekigara.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/iemhbff/buzuwebulazezubowe.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/lego_glock_18c_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_601d93382ca16.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/vebukotozokuped-weguzetovokuj.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/j8MHtsM/69093844316.pdfIn PDF document text
    • https://lemarowaverixax.weebly.com/uploads/1/3/4/3/134371099/5738602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530151/normal_602da91ebe580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5fca66ca93942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_0a98649a50e5401abe83b1355342bc24.pdf?index=trueIn PDF document text
    • http://lazuletezofik.onlinewebshop.net/carnal_knowledge_short_story.pdfIn PDF document text
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_d6ccda9c202d48aeb4ae3ae38e53a7af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/anterior_performance_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/eliminare_chat_su_whatsapp_android.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_3b891c24986744868ba1771b8487b1af.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_c07da9395b6b486bae23ae2ebf3f4d00.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_39e1e3fd207f4bffb7388b58a25e9734.pdf?index=trueIn 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_off00012a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 5424 bytes
SHA-256: 50426a21f75e9b440b646dac8a38162e36b8f1d32731de3d0908f5a09319e3f5
font_01_sfnt_off00013c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C87 11988 bytes
SHA-256: 52902398dd7be6da4e155938232ba7d22243822fe4dfe29f33b179a871c40b57