Malicious PDF — malware analysis report

Static analysis result for SHA-256 e541e85ff1f01ad1…

MALICIOUS

PDF

78.3 KB Created: 2021-02-25 18:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 17828a854a3b9dd73ca532ab2da3901c SHA-1: da8e09b3b9dcf3d2e946ace9308e27a7522bc2d6 SHA-256: e541e85ff1f01ad10c621d00bad771a1be6b8eb96285efa399b7853aad40f7e3
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. One of the extracted URLs, https://jacksth.ru/strik?utm_term=bosch+dishwasher+shx46a05uc%252F14+manual, appears to be a redirector for search terms. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=bosch+dishwasher+shx46a05uc%252F14+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469834/normal_601be53616a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492294/normal_602c4b465dfe8.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/lipubaj.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/3513545.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/zizibukoze_ravakilokomip_wizunimisopag_zuwevuvowisixi.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/e27bec71f9824.pdfIn PDF document text
    • https://jitezawedum.weebly.com/uploads/1/3/4/6/134688152/dawavitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fdc17702e689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_601749670d19b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468814/normal_5ff5423f0ae93.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/7702272.pdfIn PDF document text
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/0f9f3ba11762a.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/garmin_64st_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/89185750337.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/harman_pellet_stove_dealers_massachusetts.pdfIn PDF document text
    • http://vulomalizekuvu.rf.gd/land_registry_guide_charges.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/encyclopedia_judaica_vol_2.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 5984 bytes
SHA-256: b410cc1be182628809e5c71fc406818a295180f03a50ac115c6811d919d23df4
font_01_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 11420 bytes
SHA-256: 1d9ac8c56f1defcf381d1448997fd531f35a372973dd320fe6fac6d7d9da9ca3

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