Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e4afcf34e97fe8…

MALICIOUS

PDF

76.8 KB Created: 2021-03-20 18:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e5df86b09359f99a1156b589467550b8 SHA-1: 97bb3850c498853d12e04b993afa58ac6581c2c2 SHA-256: a6e4afcf34e97fe83565a1108fff3cf8d6f9a2b31a93dca285a96e414c92961c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=drug+induced+immune+hemolytic+anemia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477626/normal_60551d953276c.pdfIn PDF document text
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/sagupezelewun.pdfIn PDF document text
    • https://fuviwezajoz.weebly.com/uploads/1/3/1/3/131379384/3492183.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/tobalamuvosusedibaxok.pdfIn PDF document text
    • https://cdn.sqhk.co/raxulaxesob/bCNijpR/39997478473.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/67818696968.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/b7wqrih/benoxobomalinubulujexur.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/wesoxexuvap.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/mZVhghb/12467811474.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/wgc3gcB/bowling_score_sheet_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_6029860a59072.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/arthur_conan_doyle_the_lost_world_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_604e4d803b659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481273/normal_6008997ede4bf.pdfIn PDF document text
    • https://wivapitawipalex.weebly.com/uploads/1/3/2/6/132682528/xufulin-sidevipisi-ritigoxe-futuz.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/hhXiagj/pokemon_tv_series_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5fe153370e710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6fcf05-2f33-46c4-9331-499fb4cdbf7a/wuzonubamabewunik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184f8f2f-f91c-4d21-aa52-137586456eb4/does_alkaline_water_help_weight_loss.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/transition_words_for_opinion_writing_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbff270c-475b-4908-80a6-339e95e90d12/jinub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6aeffd0-e201-4945-bbfd-53e9455ee782/xagenawuwapowug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2689a72c-1de9-490b-aa97-11a279607310/robert_fagles_iliad_and_odyssey.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/8659045139.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_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 5492 bytes
SHA-256: f810269f843fd841f132407e15bbfe7549d98816de970d5ad8126132575eacc9
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 10424 bytes
SHA-256: f431ae24b288bc7984a50406e363ebdd06163a1cbc52dfa3fd80ce0d42495d69

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