Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78dfe4acdf0fa41…

MALICIOUS

PDF

78.7 KB Created: 2020-11-20 05:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da22c1e49b4081f4dd26d1f6e51827a SHA-1: d3b58c968436e5b7eb56f485e171bfc30d3d039d SHA-256: c78dfe4acdf0fa4100f13735b2d767f7c3682972964a69c357fb0cf1f7ae132c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external links, 'https://trafftec.ru/123?utm_term=periodic+table+color+pdf', suggests a lure related to a 'periodic table color pdf'. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=periodic+table+color+pdf
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f9b6ab7f14c6.pdf
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/bimozasiginup.pdf
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/tuwobidudaxot_kuvoxa_livosejatat_rafedegoruf.pdf
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5f9bac23758a8.pdf
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5fb37674a598c.pdf
    • https://cdn-cms.f-static.net/uploads/4419820/normal_5faa3be4bbd1c.pdf
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5f9cbd278780d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/72df6edc-4877-49e4-b10f-229ad2efcf69/37799867703.pdf
    • https://s3.amazonaws.com/muwemivumazulax/fikinejuxevova.pdf
    • https://s3.amazonaws.com/jumedemimo/51601808033.pdf
    • https://s3.amazonaws.com/bubodeliza/chloroformic_acid_cyclohexyl_ester.pdf
    • https://s3.amazonaws.com/gotijejaj/88003062826.pdf
    • https://uploads.strikinglycdn.com/files/5eda4aca-0c82-432e-9291-23f66667dac3/nurerowenaza.pdf
    • https://s3.amazonaws.com/jeworurowam/spelling_practice_worksheets_for_3rd_grade.pdf
    • https://s3.amazonaws.com/jeponowon/calories_for_5_oz_grilled_pork_chop.pdf
    • https://s3.amazonaws.com/lanaladu/lol_malphite_guide_deutsch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92d.bin
4f2e92aac43ec6a8b5ff7b0a734a2f1c1e1b0d7c074ff3063d239bc5dde68f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 5112 bytes
font_01_sfnt_off00010a99.bin
f21daea075d066d78da316e90422da42d4b9788c26068bafc3c59b02a6e7afd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 10436 bytes