Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a1001af80f4a4b…

MALICIOUS

PDF

79.1 KB Created: 2021-04-06 09:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7242bcd99b8a1527ae7d368191806508 SHA-1: c9d5572cd66dc1d14c43708d94aed2c0cc78b755 SHA-256: e3a1001af80f4a4b706726947b7e817f6c7d460459c200d0e8909e2488e3f0ca
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic or distribute further payloads. The document body, though heavily obfuscated, appears to be a lure related to free birthday invitations, which is a common pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/award?keyword=carte+d+invitation+anniversaire+gratuite+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368955/normal_605be175b0675.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/nisurexavis-kuril-bakikela-diketeva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5ff29ce78a179.pdfIn PDF document text
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/a790e58f18d86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503578/normal_5fed903337b99.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/4ad8a631a0fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_5fd8d3f52cb28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_6069438cad405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_6040516b10233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_601f11ef291a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462351/normal_601f21dd8eb5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_600aa21b65c6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_6068cc76a3af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_605ef375ea822.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/2400952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_60513661f2c8d.pdfIn PDF document text
    • https://zodukaveg.weebly.com/uploads/1/3/5/3/135345947/ef8877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_60420af34414e.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/mefonevimimix/cuanto_equivale_1_4_de_pulgada_en_milimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/81345670748.pdfIn PDF document text
    • http://xewuxomepe.epizy.com/66282326578.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/juxarevemunolotarodewi.pdfIn PDF document text
    • http://jowuwivipi.rf.gd/pubg_vng_games.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_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 5140 bytes
SHA-256: d5bc6006bc811a06782d4a06a5858de67ad6998d55977bc5798656ebb4779a3b
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 12812 bytes
SHA-256: 377b9b9651a943999458dd8af84e1261c8302a18423e785178f612caf61c39b2
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3