Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9f7cdbebacf064…

MALICIOUS

PDF

78.3 KB Created: 2021-04-20 08:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb50d2640d6cb78946e1a88e901275d SHA-1: bf2f754b1ac1f85b9ca60b864d4ab0e7d1b135c6 SHA-256: 4a9f7cdbebacf0641b3166ddf5e57953d887d2176bc0074e8de23932f6471b9a
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 phishing or trojan payload. It contains numerous external links, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to local business searches, likely intended to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=nail+shops+close+late+near+me
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5fd751cee2b4d.pdf
    • https://static.s123-cdn-static.com/uploads/4530578/normal_5fcf341c5fc51.pdf
    • http://welubabugokap.iblogger.org/pdf_chlamydia_trachomatis.pdf
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5fe866dd231ec.pdf
    • http://tukegutodobo.iblogger.org/91584765917.pdf
    • https://cdn-cms.f-static.net/uploads/4445326/normal_604921c42356c.pdf
    • https://cdn-cms.f-static.net/uploads/4493227/normal_604975217277e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_4fb0bafaa5414780b16bcf20541a0917.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d0c3bdb5d9594ba0a3f4a22c4797fdab.pdf?index=true
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_1f7992b5a0014b0a89967380ea496b7d.pdf?index=true
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_0dce092bccee4414bc3e915995705789.pdf?index=true
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_9df8e859694c4f7b8861a619bd413caf.pdf?index=true
    • http://nofisavopodupir.epizy.com/30989543470.pdf
    • https://uploads.strikinglycdn.com/files/4ba3c226-f61c-467c-aab1-4cd2ea7c9a79/how_the_stars_move_in_the_night_sky.pdf
    • http://kogosiji.epizy.com/last_reported_case_of_zika_in_bahamas.pdf
    • http://nelojodopon.epizy.com/zubufimiwukirepolezafas.pdf
    • https://uploads.strikinglycdn.com/files/9a059a86-a0df-4245-8076-05b5204e2ee7/wofifufaduzazurapuzatanav.pdf
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_dffc059a24374e218841c7b80eb20c28.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_d65abfd275164b87a75cc73fad79781a.pdf?index=true
    • 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_off0000f699.bin
0ecde0603c7a86ae76b0393cbef2a88b90038c7b14fcb8fb335e3a1edd3b2aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 5144 bytes
font_01_sfnt_off000107f0.bin
72e8f8d171b245a047c073c22da724f861d297ac8cd6040df196afc41573c91b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 10400 bytes

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