Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8158e72e0ea1c80…

MALICIOUS

PDF

67.4 KB Created: 2021-03-17 00:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 71fb329453037667b7d0ce6c1b67b9bb SHA-1: 9c0de0f3882e66510f5788ac2820a46c1cc76b80 SHA-256: b8158e72e0ea1c80ba9dfe72aea5c3d6489f9122bfd2e5d641c7ee53303dd661
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 0.9998

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 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://vilenefex.ru/123?utm_term=balancing+ionic+equations+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/satidaruxami/aigif0H/20_levels_thinking_2_answers.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/7669958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_6033f15caf8df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5ffe55ba6e807.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/9256702.pdfIn PDF document text
    • http://fivogudog.iblogger.org/dover_beach_discussion_questions_and_answers.pdfIn PDF document text
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/wowapegizatum.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/cZfeHgj/get_free_skins_for_among_us.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/f9imggh/famogaxezosafovilopekan.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/4VjgiaP/myat_t_business_experience.pdfIn PDF document text
    • http://gemitufelog.22web.org/fepizetapetuzida.pdfIn PDF document text
    • http://dewafev.22web.org/90701527230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_498f131431de41cbab4ee885a961ea9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/60426837093.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_e82ea0dad10840ce9dbc4dde0924f0e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/82374142023.pdfIn PDF document text
    • http://banamuf.rf.gd/life_is_beautiful_italian_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/dibond_aluminium_composite_sheet.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_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 5372 bytes
SHA-256: b580e521300894a193140e19ec44ec65586005d99f8dd05825bd590c4b7648f0
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 10248 bytes
SHA-256: 4ece8d8d33f19cf472865a54a1d6c8a52137d6f856a39f43407d6506cf2cf628

Open this report in the interactive analyzer, or submit your own file for analysis.