Malicious PDF — malware analysis report

Static analysis result for SHA-256 645089ab86ab21d8…

MALICIOUS

PDF

76.2 KB Created: 2021-05-18 18:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4d3fe74a049309ffd873e4891b0403f6 SHA-1: 281238e587862b6a4e4f0473c3506a286ac6b203 SHA-256: 645089ab86ab21d853c5b7852b7ad7d4b1a7d9ec2c10f71ea707007cd5d943bc
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'how to unjam a nail gun' and embeds numerous external links, many pointing to S3 buckets and Weebly domains, suggesting a link farm or redirection scheme. One prominent URL, https://fokemale.ru/strik, is likely the primary malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://fokemale.ru/strik?utm_term=how+to+unjam+a+nail+gun PDF link annotation
    • https://zinobelusetepi.weebly.com/uploads/1/3/5/3/135318062/pupusevijosuxe_kibufogoxal.pdfIn PDF document text
    • https://tevuluzusat.weebly.com/uploads/1/3/5/3/135397550/tofanifaso.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/wokifo-kemamemipej.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/tunenijexe/41725684540.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/4890023630.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/does_arbys_have_french_fries.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/43851322937.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/song_blow_my_whistle_baby.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/rivoka.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/muxoribujesutesuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/opera_browser_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/vw_t5_camper_van_buying_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/xezupepake.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/tascam_dp-008ex_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/meregi.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/catholic_church_choir_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/gunaxowaxat.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/70140855349.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_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 4860 bytes
SHA-256: 7e868d8aad424511fcdb6637910f039ddcc84872d16ee284be9d30240f1ff191
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10232 bytes
SHA-256: d2002bd47ffbc5bcf6f334de7788d533fe3fb113cffc481190d0404962ed4ea3

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