Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cfa528c88953d7…

MALICIOUS

PDF

76.5 KB Created: 2021-02-20 01:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f68cbf614408fb2e9c0c098f0221d67d SHA-1: 96f07ad8200d7a1463c68adf2679df0c8b464ac4 SHA-256: a5cfa528c88953d77cf4e460b4156b112ccc33863ce5490d73ba29f52d91db4d
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF SEO link farm and ClamAV detection. The presence of an algorithmically-generated URL suggests an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely intent to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://leonvi.ru/123?utm_term=the+immune+system+parham+5th+edition PDF link annotation
    • https://jepunitapo.weebly.com/uploads/1/3/1/0/131070437/6480083.pdfIn PDF document text
    • https://furujito.weebly.com/uploads/1/3/1/3/131398045/zipixevipekis-rumopujazoguniv-jipazezinup-nopewatafapalas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5ffba2ad1081a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fe5e614aa694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415531/normal_5fc9ee8bc2c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5fd2ea95a38a2.pdfIn PDF document text
    • https://topipanonotege.weebly.com/uploads/1/3/4/6/134679812/2b88c23667.pdfIn PDF document text
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/teder-saxufejokuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6019518ad66f1.pdfIn PDF document text
    • https://zigafofidonid.weebly.com/uploads/1/3/4/5/134508062/selewek.pdfIn PDF document text
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/827640.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/baro_kiteer_timer0u1ha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_5fd1288844d7e.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/jixerubowi/19716719110.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/iiit_hyderabad_admission_form_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/allcast_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/nenekadegorosi.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_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 5224 bytes
SHA-256: 7c0ca2e9d357550c92ce0a8de63ef76e16c9bfdd2aeb8f5160238bd137823ea3
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 10412 bytes
SHA-256: c7865965dece11616242de452352ab19578904874deecfc8788fff49cbb181c5
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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