Malicious PDF — malware analysis report

Static analysis result for SHA-256 a290f42fad64f2b0…

MALICIOUS

PDF

98.5 KB Created: 2021-05-31 15:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dae300020567856eefe3cf4c4bc1a2b5 SHA-1: 16c0f380b1f59b8e56dad98890756454d6163f8b SHA-256: a290f42fad64f2b01cc1b8c61ab9c7a517f983286f414653a8cfd8660b145786
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 4

  • 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.
  • 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://allytemp.ru/pbw?utm_term=how+does+a+hand+dynamometer+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388272/normal_604b4a7229da9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5feee8cf6cdc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_600f936d59c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_603f35d74eefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_5fd8c0bae51cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_6052c4242ba03.pdfIn PDF document text
    • https://pigodebi.weebly.com/uploads/1/3/4/8/134864190/c6b4ec6f493d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_60570d2ea6a2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446635/normal_60005620ebb56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424646/normal_600d8abf135a9.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/zedivikotimulaxes.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/fbc0f62d6fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_60303fe10ed1a.pdfIn PDF document text
    • https://tisizapotiw.weebly.com/uploads/1/3/0/7/130776245/226ddfb9dbddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_6050b7f7d607b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375086/normal_5fcc2de823d1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_60694ddaee68f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501046/normal_5ffbae9e48a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_60134127a2d11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_5fd8608a31c48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 5252 bytes
SHA-256: f2350afc182c936f511038379d8bf17187f3ec85735060f9e22c68ad5ac632d5
font_01_sfnt_off00013db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 12356 bytes
SHA-256: 600a481937516fcec2688f0202fe685d96e4834fc0abafdf16b6ca19b73ba47c
font_02_sfnt_off00016781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16781 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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