Malicious PDF — malware analysis report

Static analysis result for SHA-256 436437dfd1d803ba…

MALICIOUS

PDF

75.1 KB Created: 2021-01-23 14:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d55b37e551bd22916afcc3cc022965c SHA-1: b91d3398cf201540cefb56bd4f81d030b7fd4517 SHA-256: 436437dfd1d803ba8c67038492a93eb41fc76d1aa2a26db749c404e9e84107e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 User Execution: Malicious Link

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically for phishing. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the true destination. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials or session tokens by mimicking multi-factor authentication prompts. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing attack.

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://druttle.ru/123?utm_term=how+to+delete+a+fortnite+account+on+switch
    • https://site-1168079.mozfiles.com/files/1168079/gibirofar.pdf
    • https://site-1171522.mozfiles.com/files/1171522/74208894619.pdf
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/pabume.pdf
    • https://jedavosezinuli.weebly.com/uploads/1/3/1/4/131438835/zafesisiraneje.pdf
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/577db4.pdf
    • https://site-1177636.mozfiles.com/files/1177636/bloon_tower_defense_5_free_play.pdf
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/zamodokitaxu.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/kemiga_selizevopuruwiw.pdf
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/5ba37f6.pdf
    • https://site-1168360.mozfiles.com/files/1168360/36044992142.pdf
    • http://bofinaposo.iblogger.org/36930408520.pdf
    • https://videtibap.weebly.com/uploads/1/3/2/6/132682663/bonek.pdf
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/jikikafafagabo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sepawi/epic_sports_live_tv_app.pdf
    • http://ratudafoxivux.rf.gd/mathswatch_answers_year_7_algebra.pdf
    • https://s3.amazonaws.com/kudefem/nudutexidi.pdf
    • https://s3.amazonaws.com/ginutu/sigasixulewuxivu.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/house_of_fraser_manchester_store_guide.pdf
    • https://s3.amazonaws.com/lusegokaves/freeman_ft_buffalo_soldier_mp4.pdf
    • https://s3.amazonaws.com/towutoginadivu/adobe_xd_wireframe.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_off0000e9af.bin
38e9b2a0a2d98de2678c60cfa2905b5b79853b4b5edea380cdbd1af9fb3d3392		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 5160 bytes
font_01_sfnt_off0000fb4c.bin
af6ee03e114b785d8007bcedaee2a9f97547430486cb8a35d3cc3d274a29e493		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 10428 bytes

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