Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc705f4ff23dca10…

MALICIOUS

PDF

78.5 KB Created: 2021-05-16 22:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff0c7330280ed395aba9822513064cf9 SHA-1: 680c853804fccfd4467310a1040cae14c9c5c0d2 SHA-256: fc705f4ff23dca1003a6aa438948d420ae2611f7a7097537bdb82c3382c8d7f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. It contains a large number of external links, many pointing to Weebly and other domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=the+choice+philly+mcmahon+book+review
    • https://lekibuwowobaveg.weebly.com/uploads/1/3/5/2/135295955/wifaterulatamegafun.pdf
    • https://cdn-cms.f-static.net/uploads/4414331/normal_6056896bba1a5.pdf
    • https://cdn.sqhk.co/gevagedubop/f8NKrja/newborn_fall_baby_boy_clothes.pdf
    • https://cdn-cms.f-static.net/uploads/4416791/normal_6047684cb22f9.pdf
    • https://cdn.sqhk.co/xejudawadoni/P9ehbon/wexawunutujuzilubi.pdf
    • https://cdn.sqhk.co/jalexire/W2hdNpK/sharp_aquos_net_netflix_app.pdf
    • https://cdn.sqhk.co/xidatelo/jgPHjjh/2132348814.pdf
    • https://cdn.sqhk.co/retagigimusa/hbwQha7/30631562978.pdf
    • https://cdn.sqhk.co/dugixikisim/hFy9rRO/spartan_firefight_apk_hack.pdf
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/baruvuwufalujafiwude.pdf
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/4819226.pdf
    • https://cdn.sqhk.co/vopuvafamiw/hhhdjj9/sisters_thai_fairfax.pdf
    • https://wewowaxidibu.weebly.com/uploads/1/3/2/3/132303239/gowekolifinenam.pdf
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/xagufepikirizu.pdf
    • https://tefajarusi.weebly.com/uploads/1/3/0/7/130775660/gevudi.pdf
    • https://static.s123-cdn-static.com/uploads/4407301/normal_5fc68e2cb0fc9.pdf
    • https://cdn-cms.f-static.net/uploads/4412607/normal_603d40cfb2132.pdf
    • https://rumevupalod.weebly.com/uploads/1/3/0/7/130739773/wusatisigesitiwu.pdf
    • https://cdn.sqhk.co/wosipuvetot/ifjcjef/nilitolalu.pdf
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/gunus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jasadavebaga/71977959048.pdf
    • https://s3.amazonaws.com/lefemijip/93206416132.pdf
    • https://s3.amazonaws.com/viregujipowuru/6010325508.pdf
    • https://s3.amazonaws.com/jokotaziweluge/35362395485.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b8.bin
18f06de758175e9e22499fade62975dbd9c9980279aba5be84323a672125f07f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 5404 bytes
font_01_sfnt_off00010705.bin
43c598387234ede62d016c2079042e6e16f72bbaeda66718d8c7c45d9c428afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10844 bytes

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