Malicious PDF — malware analysis report

Static analysis result for SHA-256 877b147fbec3c01d…

MALICIOUS

PDF

71.0 KB Created: 2021-04-03 20:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4e4cea11a12b40e697431e246ff1e6ef SHA-1: 312d32be95d6649acc788ee574a8e7f79505fffd SHA-256: 877b147fbec3c01d2143e3fd6b9bb14a734bf205b80c13f54bbc4b5d3473618b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. The embedded URLs and the PDF structure point towards a phishing or malware distribution campaign.

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://pelibifir.ru/123?utm_term=john+lewis+glasgow+store+guide PDF link annotation
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/9520b9323c7.pdfIn PDF document text
    • https://womijepadake.weebly.com/uploads/1/3/4/4/134476187/b32367db.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/kekalinuwakineza.pdfIn PDF document text
    • https://fimelaxezabu.weebly.com/uploads/1/3/4/6/134622198/609d17c8bb2ffd.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/50f65d2c18ab685.pdfIn PDF document text
    • https://lopenedaxi.weebly.com/uploads/1/3/1/6/131606218/naveziminujomaj.pdfIn PDF document text
    • http://doordash.link/cnn_latest_election_news_usapgsqq.pdfIn PDF document text
    • https://bamutemo.weebly.com/uploads/1/3/2/6/132681362/8ef1259aa9e2a40.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/AH2jaji/brimstone_hotel_menu.pdfIn PDF document text
    • https://suzavopuwo.weebly.com/uploads/1/3/4/6/134686694/6d2944798edd84e.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/giuihic/petroliana_auctions_2019.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/zitaki-sapikeju-gajomasataloja-gofutefe.pdfIn PDF document text
    • https://lutoropekitixes.weebly.com/uploads/1/3/1/3/131384777/deaaad447.pdfIn PDF document text
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/bebuv.pdfIn PDF document text
    • http://rm-swis-mine.com/2013_dodge_avenger_thermostat_housing_gaskethc7o2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dalava/power_amplifier_repair_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/cidco_tripartite_agreement_format.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 5168 bytes
SHA-256: 2208708c2bc16775ce13fd78dad59739ff049004a766c0625706947ca985bba1
font_01_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 10464 bytes
SHA-256: 93a1d72589629797ba94474a924f97923f238cc025d6960ad53a1dce265714e4

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