Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e36778f5d1cda01…

MALICIOUS

PDF

96.3 KB Created: 2021-03-16 17:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77cc0f655e705a6fb5cfd42ddb92bf80 SHA-1: 9d06de9c9604ce702c1fb2c3dfb6c33ec08248ba SHA-256: 5e36778f5d1cda01fb8727309803ef3782d2e3bf8fa2b68bacd7b8c4bf42b60d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the potential for embedding malicious content or redirecting users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=night+walker+guide+maplestory
    • http://jorowijedo.mywebcommunity.org/what_causes_a_washer_to_not_spin_out.pdf
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/8504341.pdf
    • https://gipurama.weebly.com/uploads/1/3/5/9/135966135/4376714.pdf
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/f7de8b1ac7b4.pdf
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/3637018.pdf
    • http://hookup157.online/android_google_maps_app_avoid_highwayss5yfa.pdf
    • https://kalokawagubur.weebly.com/uploads/1/3/1/3/131398574/nevuge.pdf
    • http://tekdouche.xyz/dudipamelugsonbb.pdf
    • http://raguvigawak.mypressonline.com/tofanajazikidufunafum.pdf
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5fcf4d0e587ba.pdf
    • https://boxagabopevonud.weebly.com/uploads/1/3/4/3/134353696/e976c7eb1.pdf
    • https://nakojuxipesasam.weebly.com/uploads/1/3/0/7/130776326/xikupotupopenu.pdf
    • https://static.s123-cdn-static.com/uploads/4475559/normal_6002733fa0e2f.pdf
    • http://probkin34.xyz/jogegagodiworazutagcn5qe.pdf
    • http://servempieza.site/mosadurigku8nw.pdf
    • https://vowevabejera.weebly.com/uploads/1/3/0/7/130775986/jobuvef.pdf
    • https://neninilez.weebly.com/uploads/1/3/3/9/133986457/zivuvukozazura.pdf
    • https://cdn-cms.f-static.net/uploads/4485299/normal_6028b4f132203.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sajajuladepume.rf.gd/dekebavodaroxo.pdf
    • http://tinipukax.epizy.com/fipedivizexuliridefinodi.pdf
    • http://gedobesixo.epizy.com/how_to_turn_on_my_fitbit_inspire_hr.pdf
    • http://gabitotedusaled.epizy.com/2005_ford_focus_service_manual.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_off00013980.bin
9ac8acdec24541d521df3f062da42c99bc9daf8022dc4a929d5d961df2df7ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 5600 bytes
font_01_sfnt_off00014c86.bin
74abed655b90d53463aed12e71e0a4b5bf5a48a0cd9db9f4013c49db19cb0ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C86 11288 bytes

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