Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f5a843733d80fe…

MALICIOUS

PDF

78.5 KB Created: 2021-04-29 12:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 53e78aade4c2ecd3a3d262aa76e22d82 SHA-1: 2a6aaf534a785c185922cda4906a41fe49614e5b SHA-256: 18f5a843733d80fe6439130243bc0eec8ccab1f990b483152b8fe489b80f5170
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Numerous embedded URLs, many pointing to disposable domains, suggest an attempt to direct users to potentially malicious sites for phishing or malware delivery. The document body contains metadata and garbled text, indicating it is not intended for user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=what+capsules+are+compatible+with+baby+jogger+city+mini+gt PDF link annotation
    • https://cdn.sqhk.co/ramazunor/0zypiep/sakura_school_simulator_di_apkpure.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/dulepabewuxobag.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://ses-paypal.com/40721274868b98k9.pdfIn PDF document text
    • http://rollernefritmassage.xyz/dubanxw6y8.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/Ojfifhe/98449313258.pdfIn PDF document text
    • http://silver35.ru/269756621674zzdn.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/kopuli.pdfIn PDF document text
    • https://cdn.sqhk.co/mibazudifij/gfsAgfV/91173139711.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/shadow_leveling_guide_poey5jy5.pdfIn PDF document text
    • http://martakkord.ru/509793964as2a2.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/8a184047.pdfIn PDF document text
    • http://fridgeservice.ru/sans_undertale_megalovania_earrapelmw1x.pdfIn PDF document text
    • http://instapriz.site/netters_anatomy_coloring_book_reviewx5han.pdfIn PDF document text
    • http://kernig.store/lg_stylo_4_user_manual_spectrumznfdd.pdfIn PDF document text
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/nupabobixazu.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/hcgjhim/cross_stitching_store_toronto.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/ji5pihU/word_nature_in_different_languages.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/00cdf4ca-0cf8-4dff-9b9e-9a0804d7cee2/pokimimifamifukimanepitot.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/29951994788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b92627-1df2-48c9-8e6d-9c93d1016875/karuvizijebibijem.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_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 5768 bytes
SHA-256: d5bfaa6d991e4844b5c57d7674e6bc4e71bc3ae205ea5f77aee08e5bd71224c2
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 11032 bytes
SHA-256: 68919badeffdd167b35a45a12de91d1b8c5934d0d2090c8c7933abb16a1bb0d3

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