Malicious PDF — malware analysis report

Static analysis result for SHA-256 57681ffdc36f9dba…

MALICIOUS

PDF

95.3 KB Created: 2020-11-14 16:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fd41cfd4113cd3d3e47251fcc91b5b4c SHA-1: 1ef584118b300f5a4b6a4cd12c9d0f20247f6a7c SHA-256: 57681ffdc36f9dba12e83c706e81efaf8788ab92f07f58019a4ebe2e8002165b
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 flagging it as a link farm. One of the primary external links points to a URL that appears to be part of a phishing or malware distribution scheme, disguised with a search term. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=fire+emblem+anime+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5fa8d8c8dd88f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f94e68f597ab.pdfIn PDF document text
    • https://xibopenevitamog.weebly.com/uploads/1/3/4/4/134488628/5973207.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/nemoduxigazinoj-kafowupivafakov-zujofuresad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f8e7d265945c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5fadcddac57c4.pdfIn PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/sibumixexofuxoliz.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/nufidibodudulad/samsung_combination_files_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/dubufugobilunaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d92786-be5c-44ba-a61b-2d2670a10844/maxusivesezidelosetapobe.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/todojesosugaluwukame.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/story_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9ad2aa-dfaa-4d58-b23f-b11870b523c1/franciscans_of_the_primitive_observance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0058f3df-ca83-4e82-b419-79f49ebc9790/bibupatoxipigovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2eaa979-c7b7-4f5a-b344-ee83761a4575/dot_inspection_forms_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/area_of_shapes_test.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 4616 bytes
SHA-256: 0c1536925816b7b7433831ae5297b794a978de0759c02ea5c9d8b47c6d48fb3b
font_01_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 4828 bytes
SHA-256: c4a66fd55e8629bb8d59b335cfcceb46ca7237e124295208176bad249fe27226
font_02_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 11708 bytes
SHA-256: a84d4ab755a1578a3eaa450953f50e7150cf0e4738f96706e66980afd9aa29f3
font_03_sfnt_off0001617d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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