Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac57b788612c9659…

MALICIOUS

PDF

85.7 KB Created: 2021-05-21 10:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9e56705c8830f393183e8b7a0f2f8792 SHA-1: 8c2194a1002fbfb7f9702400ae8c266b8e6f8ff5 SHA-256: ac57b788612c96590fe27b5c0cf03c4545f599061b002ce30f96ca723f9383a1
156 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 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 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=best+tweaked+app+store+android PDF link annotation
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/839a32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465396/normal_600209678bb69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492580/normal_60632be503818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_60399bb86e24b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_6042434e69bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5fd7d58daf0bc.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/lufanetit_suxasevine_jamar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5fc5984e4cefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_600a5647bdbec.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/judutem-gajamozok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_606b084f3d0da.pdfIn PDF document text
    • https://xutifivaluladar.weebly.com/uploads/1/3/4/3/134337767/4173377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_6023fbe198fc1.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://uploads.strikinglycdn.com/files/c17b6db0-f75b-4694-b4be-64cc15ed2d16/line_6_ux2_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8149f519-1822-4ee5-b4a1-038d17eae41b/what_is_the_role_of_a_guardian_ad_litem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d42b67e-f7fd-4697-aaf2-56414c8f119d/life_your_life_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246052f3-1d42-412f-b429-64ee92fd0443/most_uncommon_last_names_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5d0e5e-739b-48b1-b9a9-fcb2cb17d8c3/lolaguxi.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

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_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 4912 bytes
SHA-256: 6080a784bd16e4fc7ecbfeb03f1833b499f627cb86c42e86250015627ee590d5
font_01_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 10792 bytes
SHA-256: 4c007e2b9b522b705c8bbb4162063d365a2565cccafadd0660670a6dff8f6319
font_02_sfnt_off00013bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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