Malicious PDF — malware analysis report

Static analysis result for SHA-256 658a2ee49c8f24ae…

MALICIOUS

PDF

90.7 KB Created: 2021-03-16 12:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1d1e43347391fce0c105799b4dfc77 SHA-1: e6922b8f97c9544d278f15df663e0b414bc35c77 SHA-256: 658a2ee49c8f24ae416cd0d9d40ecb6c631cbe3e7179f8a7663ecd67c77c4c6d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, 'https://pelibifir.ru/wix?keyword=proportional+reasoning+6th+grade+math', suggests a lure related to educational content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/wix?keyword=proportional+reasoning+6th+grade+math
    • https://cdn-cms.f-static.net/uploads/4444110/normal_6046d0332eddd.pdf
    • https://cdn-cms.f-static.net/uploads/4371495/normal_60130636d4851.pdf
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fc6c6eaaba03.pdf
    • https://renijekut.weebly.com/uploads/1/3/4/3/134306869/fuvas.pdf
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fcfa55d2ce4e.pdf
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5fe447b2a538e.pdf
    • https://static.s123-cdn-static.com/uploads/4466364/normal_5fcea336e03e7.pdf
    • http://lisojuribopuwad.22web.org/why_i_am_not_a_hindu_by_kancha_ilaiah.pdf
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/jaxinapumebi_buzavejex_dunodufuseban.pdf
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5ff4fea440701.pdf
    • https://vusuzawemuli.weebly.com/uploads/1/3/0/7/130775102/9893766.pdf
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6034de2675679.pdf
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fe0f2754daea.pdf
    • http://sonoxusa.iblogger.org/92858312906.pdf
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5fee9d619a025.pdf
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fe2265919eea.pdf
    • http://pesizememol.22web.org/5691319707.pdf
    • https://cdn-cms.f-static.net/uploads/4389358/normal_6044facb1c10b.pdf
    • https://peliretoru.weebly.com/uploads/1/3/3/9/133997281/wulekiwajokixobar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pefoxaxogux.epizy.com/58528838259.pdf
    • http://gajiresidar.epizy.com/all_information_about_maharashtra_state_in_marathi.pdf
    • http://kifofok.epizy.com/76576762416.pdf
    • http://fefezaw.rf.gd/what_happened_in_the_us_in_1871.pdf
    • http://parigavubezij.epizy.com/motufeparavetox.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_off00010c94.bin
240d63c57244e1479c54368e55cc749fce64a6a11ed3ddc56bbe00e718a5ba1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 5528 bytes
font_01_sfnt_off00011f2f.bin
8be49180d5df6585caaf61b0d8d41719add63140614da4a30b0762f6f7927f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 11860 bytes
font_02_sfnt_off000145cf.bin
6b423e1fc23ec69c7e7354aad3058039b7d651f2e39d6be5876bb2af2e41f99f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145CF 16288 bytes

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