Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e9a07b81cf870b…

MALICIOUS

PDF

88.0 KB Created: 2021-03-27 21:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d84c0e4ac010a2713c79b866aeb74f3d SHA-1: 9eeda15a21cd26b12f7e69ed642941b936410b14 SHA-256: 64e9a07b81cf870b7f0c06bcabb9fbdb8f3468f28ec83120a3865ebe88d8a626
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, contains a title related to relationships, which is likely a lure to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://nipisod.ru/strik?utm_term=how+to+make+him+chase+you+long+distance
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/newese.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/xobafometi.pdf
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/ec3194d5.pdf
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/3671319.pdf
    • http://juwaniwabi.medianewsonline.com/59369209178.pdf
    • https://cdn.sqhk.co/gatavazer/9hjD2dx/25129326824.pdf
    • https://cdn.sqhk.co/daboxazile/jihekDZ/19816787147.pdf
    • http://jeseselanus.scienceontheweb.net/kivoravazezesumejonodaku.pdf
    • https://wuwikofoxanep.weebly.com/uploads/1/3/1/4/131437976/xisapimatemalajusaka.pdf
    • http://pamuvelap.22web.org/webavupukagonilenekadegev.pdf
    • http://gukovukub.22web.org/75296700756.pdf
    • https://zevupizufaf.weebly.com/uploads/1/3/4/3/134315684/1c3d705fb29.pdf
    • https://cdn.sqhk.co/xelajura/ifihdgd/86994667289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedure/lizuf.pdf
    • https://s3.amazonaws.com/loneminovu/34398542166.pdf
    • https://s3.amazonaws.com/gafedupeba/seventh_day_adventist_church_clerk_manual.pdf
    • http://ramawotinejog.epizy.com/how_to_do_cheerleading_flips_for_beginners.pdf
    • http://desavoz.epizy.com/dafatawivurakaredubilap.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010451.bin
63a004b95091e530becb0b45efbe1951a4059be89d9f3fb6d9b6425c5ac77514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 5476 bytes
font_01_sfnt_off000116dd.bin
a7bbde67d613614c7e8c6916baa1180ec271baf97151e8fdaa5ac3f96c4a1c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 11116 bytes
font_02_sfnt_off00013cbc.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBC 16312 bytes

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