Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c4228163376bb5…

MALICIOUS

PDF

67.4 KB Created: 2020-11-29 02:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6626feec9eb04c2274e66690eeb9315b SHA-1: 0060e9e6603cb42772563b2cac331fdf4ff3ce4d SHA-256: d1c4228163376bb5aa9af07a29b7b0767247e36846c08dbc4c398d20af1fda33
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, directing users to a suspicious URL. The document body, though heavily obfuscated, contains text that appears to be a search query, suggesting a lure. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=is+my+bird+google+feud+answers+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388626/normal_5f91d34423c12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_5fb2784d4d927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_5fb3d39560cd2.pdfIn PDF document text
    • https://fufiganegobugu.weebly.com/uploads/1/3/4/4/134496384/zirimijawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489441/normal_5fb540d7a9279.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/mukefuxibedekinuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5fb4b3f17ef4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_5fa2f7302df6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_5fa8b9e6c1960.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d554b3-69f3-4e36-aa81-be2ffbcac32c/ap_lit_essay_a_streetcar_named_desire.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/anti_malware_mac_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5944929-b4f7-4a42-860f-fdfdbbb11796/bawafisatuxolizukuvosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87144000-f36d-4a67-b560-a696dfbdf932/productos_tercera_sesion_cte_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052063e7-bdc0-40f3-9f34-e4a56ec5db8b/79819144732.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FE 5980 bytes
SHA-256: 0d4a19f4359d926885bcb44b18b4e78bec8023ee132b78a77d573ffeac8e3f9f
font_01_sfnt_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 10404 bytes
SHA-256: 21f248b0437aed6525167aefb5663453f8a204aa9edc44b9dbaacdd73931eb2e

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