Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1492c105287adae…

MALICIOUS

PDF

90.3 KB Created: 2021-06-03 07:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ddda97f290f6dee8262f1bdcecf3674 SHA-1: 82090f3c2bf5004a9a2d1ac5e3ebeaa6ccca3a09 SHA-256: b1492c105287adae4299c641353c58add4c7ba66f37685bade23a83561f12bac
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The presence of a 'Password-protected archive handoff' heuristic suggests that the document may be intended to trick users into downloading an archive, which would then require a password provided by the document itself, likely to bypass security scanning. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/pbw?utm_term=ethiopian+constitution+afaan+oromoo
    • https://cdn-cms.f-static.net/uploads/4451230/normal_6021f91ff2e91.pdf
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/mokowujemuvekerifevu.pdf
    • https://raketesi.weebly.com/uploads/1/3/4/6/134632322/gowekoved_goxixonelixo_xoderus_ziwisalojot.pdf
    • https://static.s123-cdn-static.com/uploads/4451955/normal_60034a4ad027b.pdf
    • https://cdn-cms.f-static.net/uploads/4446774/normal_6030eb093f875.pdf
    • https://cdn-cms.f-static.net/uploads/4475572/normal_60380c4c4517c.pdf
    • https://cdn-cms.f-static.net/uploads/4445125/normal_604bbb09908c5.pdf
    • https://cdn-cms.f-static.net/uploads/4385847/normal_603851826c2c7.pdf
    • https://cdn-cms.f-static.net/uploads/4374359/normal_604ede92ad02c.pdf
    • https://cdn-cms.f-static.net/uploads/4497358/normal_60293f234ff7c.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_600a9fa6b4b7e.pdf
    • https://zijobukevas.weebly.com/uploads/1/3/1/4/131454580/vasef_somareleja.pdf
    • https://static.s123-cdn-static.com/uploads/4382003/normal_600700eedeae6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/adbfbe7c-c7dd-4803-b2cc-f5399d6533cc/the_odyssey_discussion_questions_book_9.pdf
    • http://jizakatum.pbworks.com/w/file/fetch/144519732/rezijuzitogifo.pdf
    • https://uploads.strikinglycdn.com/files/51622b7a-d9fc-47eb-9ea5-525e6acd9631/tokyo_ghoul_re_opening_piano_sheet_music.pdf
    • http://zubipuwaf.pbworks.com/w/file/fetch/144529209/98480349927.pdf
    • http://dawijunegolo.pbworks.com/f/9265279673.pdf
    • https://uploads.strikinglycdn.com/files/c0a8cdd6-7a6d-48ed-8d3f-7647fcc84b28/what_to_do_if_no_quorum.pdf
    • http://zufumegi.pbworks.com/f/zarizazajaroradajave.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011071.bin
8bda20ccec9df8361dcdfa025fcd4e45b3e0c12bc7afa070e2b1bdf4017f7438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 7160 bytes
font_01_sfnt_off00012290.bin
4b0dd2fae33d0a41c0e9c7f791e2c9135570ddab7d2f897e35cf0b1874d758e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 5180 bytes
font_02_sfnt_off0001340a.bin
1171c4aa33e0a14831e830e88a239b16135ace5161f09293e3fe3c93f409f7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 11552 bytes

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