Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd5f8e8804436e4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 02:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a16dc7b3ac31efe5f3179e85333485fb SHA-1: 7f5b7bd8a0f9e93f61e5e5253117e77c31cfce5d SHA-256: 5cd5f8e8804436e47180f62f2cd9dd6fd5298d69884732d8941e606ed3e023e5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary URL, 'https://jacksth.ru/wix?keyword=ge+spacemaker+microwave+manual', suggests a lure to disguise malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

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://jacksth.ru/wix?keyword=ge+spacemaker+microwave+manual PDF link annotation
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/dopaxejigetazu.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/jetakiw.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/11a568e0e908af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5fc5bbd0bc168.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/jarawetupatesobosise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_5fe81f9edff9b.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/9895730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_603387586888c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_60116a4785ae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_5fe9129d1d2e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5ff38314aaeef.pdfIn PDF document text
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/dfd5bf4974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/industrial_accident_report_format_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d72bdd-9d01-487a-81f5-f03510e30f9a/34824555901.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/gebudekarowit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be5d1ab-aead-438b-8f56-85377770f77f/tinder_cheat_codes_connor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76114c73-bccb-45f5-979f-2c8b3fb2962e/7088268715.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/fomapufetigezukozuk.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/classifying_chemical_reactions_worksheet_carson-_dellosa.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/68643089068.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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 5328 bytes
SHA-256: 67c9a20df01642f5e7586ae959ef0416119fc004dc2a8d5880ae2dfa961f2084
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10808 bytes
SHA-256: ee19493fa69e604e0ec345753e009ebd8842ac7482b27de88cd7805737a12d29

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