Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c1c901b549a865…

MALICIOUS

PDF

90.6 KB Created: 2021-03-24 19:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ca908066ca03b051642b97dd6058f7e0 SHA-1: 57d220827c18c2de39dcce5e94f1e5787013fe81 SHA-256: 69c1c901b549a8656759c20bbd5a2e8a7c96e0b6ac5c544aaba5094c77f5662c
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 0.9983

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://golowaki.ru/wix?keyword=minecraft+words+upside+down PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5feaf26f6592b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_6046f0d985a50.pdfIn PDF document text
    • https://jovopunok.weebly.com/uploads/1/3/4/8/134869647/a3e322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_60070020c8f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_60244c278cbcd.pdfIn PDF document text
    • https://sokexeziboril.weebly.com/uploads/1/3/4/9/134902232/1138682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5fe673a8ad428.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/tixevuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_5fd27edd0333d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403266/normal_60057742ecf08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fc6be3860432.pdfIn PDF document text
    • https://palobakuk.weebly.com/uploads/1/3/4/5/134523632/relezorag_bojesulekudas_guvatin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fcf8699062de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414175/normal_5ff8d6ace8454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_600c08a0bac1e.pdfIn PDF document text
    • https://xekijepomi.weebly.com/uploads/1/3/4/5/134508866/8085177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5ff61df9cfd0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_6058ddc1d2f7e.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/tubukeganuji/texivitatowaxakozijanavad.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/zisew.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_e1b970856756462fa0700d636553bc59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/30835163541.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/bubble_games_for_java.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_3ee477c9481742d8994f3706aa084686.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_45544e27c1d44ddab335ba642a65b36e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 5096 bytes
SHA-256: b8e0fdb170bcd143cc5aa03e536254d46bde8853e702bf576bfd318238d2729d
font_01_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 12160 bytes
SHA-256: 183b451649cbc66d6b75691106bb95ca22003d4984c6dffe50c37d4d002c2206
font_02_sfnt_off00013941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13941 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c
font_03_sfnt_off00014e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e