Malicious PDF — malware analysis report

Static analysis result for SHA-256 426bcc427714f26a…

MALICIOUS

PDF

75.9 KB Created: 2021-05-12 01:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45de5da69337c7acadd9e439603df09c SHA-1: 7cb735713c8ca9a794b0b27985524adb200dc787 SHA-256: 426bcc427714f26adbf90a04d8e365c43d9496d4ed0d81a46eb52804dcd24a27
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary malicious URL identified is golowaki.ru, which is likely used to host or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=canada+post+air+mail+cost
    • https://cdn-cms.f-static.net/uploads/4411683/normal_602712465b0ca.pdf
    • http://qwertyujg.xyz/72614712594509e7.pdf
    • https://cdn-cms.f-static.net/uploads/4501486/normal_604337b9e6709.pdf
    • https://cdn.sqhk.co/zeritogekuja/fGgiMOF/83159068501.pdf
    • http://instasurprise.online/66636342278zuete.pdf
    • http://leoidet.xyz/bodagilutobitab6pejp.pdf
    • http://ourfanz.com/what_is_an_example_of_static_equilibrium_in_everyday_lifer1qtc.pdf
    • http://reabook.online/96103453121kvv9d.pdf
    • https://cdn-cms.f-static.net/uploads/4491153/normal_6044d89644d30.pdf
    • https://cdn.sqhk.co/fofateze/iheRsRG/versace_chain_reaction_black_on_feet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_430fcbf18cb54e42b2240f9c5bb1a330.pdf?index=true
    • https://s3.amazonaws.com/wifiduxezo/dewalt_dw718_used_price.pdf
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_cd1b3d8328b04c2ba68480b5fd19aff9.pdf?index=true
    • https://s3.amazonaws.com/xeroguru/alphabet_colouring_sheets_printable.pdf
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_7747b564444148d4b97cadceb0998b7e.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_fe0a3b160dba4ceaa5c41a84267a3d89.pdf?index=true
    • https://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_eaf7ea8b0de446f0b39034f55589a120.pdf?index=true
    • https://s3.amazonaws.com/widofafane/50487556227.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_off0000ead4.bin
606d0ed7e7729cc42bf0b990c30cf9ddccb396a382b305daea74170680f53916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 5124 bytes
font_01_sfnt_off0000fc21.bin
f6d92135d3078bd28cf674e2a4f68632235f27d93ce66a0e34c63ab9ed294c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 11292 bytes

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