Malicious PDF — malware analysis report

Static analysis result for SHA-256 493eef4d8751b8a3…

MALICIOUS

PDF

77.0 KB Created: 2021-05-22 21:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 839ed0357332b1394cb2784089f25966 SHA-1: 55c0c6734e895cd1b4f27fc9b0951d77f76028e4 SHA-256: 493eef4d8751b8a3b7c65d81b9b171dc76f74cb95a91ebd80dd152f06698b891
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many of which are hosted on S3 buckets and Weebly, suggesting a link farm or redirection scheme. The primary external link points to a URL that appears to be a lure for downloading media, which is a common tactic for phishing and malware distribution.

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://dafemum.ru/strik?utm_term=jurassic+park+3+full+movie+download+in+hindi+moviesflix PDF link annotation
    • https://fupakedozoj.weebly.com/uploads/1/3/1/4/131407080/nomawuberiji.pdfIn PDF document text
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/78d979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_604e82fed2bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_605a7d70cb87b.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/445483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_605f7e98acc02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_6033a25c1709f.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/2006308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426257/normal_5feafc0b95533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_6063d39888546.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/nezanurugega/4416284844.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/safety_data_sheet_ethanol_absolute.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/80743943461.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/97207684495.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/10896392767.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/gurps_lite_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/diablo_2_elemental_druid_skill_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/77238681092.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 5632 bytes
SHA-256: ad35477246f8d0d11e04c3e054480f3bb7a261ca94e727b327a66e08207bedfc
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10076 bytes
SHA-256: 3eb430290052357bdea8654b014ec2a238a3e1832298c1ee8d248b0c2e15c4c2
font_02_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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