Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a40731ad5626fd…

MALICIOUS

PDF

78.5 KB Created: 2021-04-06 23:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c04b87fac19cac7b0aa10f06c78c5372 SHA-1: d36acff5b8e0f05be2c7b63a112a46c11278d3d7 SHA-256: 17a40731ad5626fdf1f07f32406c86990a92e4c3a51a3c8d601281970e5e2f0b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to suspicious domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://midufefew.ru/award?keyword=paul+romer+endogenous+growth+theory+pdf
    • http://afracheat4.xyz/25401956905itecy.pdf
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/nexokudu_rororu_vidawe.pdf
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/6321571.pdf
    • https://cdn.sqhk.co/bibolaned/eyhher7/the_archers_radio_4_listen_live.pdf
    • https://cdn.sqhk.co/vawapisoxe/8DkXabi/teacher_appreciation_thank_you_note_to_parents.pdf
    • http://lnstagramcentre.net/ucz_bemba_hymn_book_apk_downloadtcdb3.pdf
    • https://cdn.sqhk.co/xunijejozi/ifiajc4/telifivepe.pdf
    • http://neojust.ru/jazzi_disciples_ara_robaladwyco.pdf
    • https://cdn.sqhk.co/zasemewiti/Ghc3hdG/53312909701.pdf
    • http://dvertsoff.ru/what_race_is_best_for_nightblade_eso7bhfw.pdf
    • http://seritepaxuv.22web.org/how_to_write_a_reflective_response_to_an_article.pdf
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/3599665.pdf
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/gidetisu-buturetop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/midipes/begimelodomi.pdf
    • http://poxotoromerolu.rf.gd/clinical_medicine.pdf
    • https://s3.amazonaws.com/jufowokedunod/beyond_earth_tech_tree_guide.pdf
    • https://s3.amazonaws.com/rizezobabub/sepesajufimadulodugagan.pdf
    • https://s3.amazonaws.com/tutasujal/sarulowes.pdf
    • https://s3.amazonaws.com/pezofut/52209995871.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e759.bin
4ec083c2661b7705ce9b267a5491eeaf5ecda254e3f545c4de05de09ecee9785		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 5484 bytes
font_01_sfnt_off0000f9e6.bin
600df2e36170427e1d59d1c5b616a5b1c184b8b5925458891e6562252e44904c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 10656 bytes
font_02_sfnt_off00011e5d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 4324 bytes

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