Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b16ae68cf1b3a29…

MALICIOUS

PDF

82.2 KB Created: 2021-03-21 06:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b9b15c30a303779730abf738b597c021 SHA-1: e1a522fcb6db7aaf9f814e82875be19ca5aa55c3 SHA-256: 5b16ae68cf1b3a29f2e8623c07e13b8bb126afbaa8ab7c8ce9a076566eef4c7d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, contains keywords related to search terms, aligning with a lure to a malicious website.

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://seumenha.ru/123?utm_term=mattress+in+a+box+reviews+consumer+reports PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443371/normal_602df22822aa8.pdfIn PDF document text
    • https://bepefuligifeval.weebly.com/uploads/1/3/5/9/135981888/zelosubevupogur.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/c58e8ead.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/17192921552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5fff6201b7ee8.pdfIn PDF document text
    • https://tupemewona.weebly.com/uploads/1/3/0/7/130775182/9065891.pdfIn PDF document text
    • https://jakuxibakamu.weebly.com/uploads/1/3/1/4/131407414/nagigibowopujif_jalisemarif.pdfIn PDF document text
    • https://wiselorasen.weebly.com/uploads/1/3/0/7/130739143/2b7d066ed56.pdfIn PDF document text
    • https://buzelobuledu.weebly.com/uploads/1/3/1/3/131397981/mugitufesoxana.pdfIn PDF document text
    • https://winiwezunubesu.weebly.com/uploads/1/3/1/3/131379740/2dd2fffcb42110.pdfIn PDF document text
    • https://mogewojelepa.weebly.com/uploads/1/3/4/6/134681452/sefezixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dea4b56-f175-4203-8a83-c8127e080cbb/vovagudobelanituwuxip.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/how_to_say_answering_machine_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/how_many_words_has_harry_potter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab7274d-e060-4819-a49c-a5461ed0a750/how_to_interpret_gdp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c80cab-c917-4dd9-8762-c7162041ada5/gonuropa.pdfIn PDF document text
    • http://xojudemavu.onlinewebshop.net/68709305946.pdfIn PDF document text
    • http://tokozod.myartsonline.com/how_to_reset_a_amana_front_load_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/hoover_cyclonic_stick_vacuum_manual.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_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 5412 bytes
SHA-256: 1cbfd7189f18649be17313a457379bd3bb247e584959a0b84709bfbe99bb111d
font_01_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 10656 bytes
SHA-256: e507a93cef16bc130f827c2f9a8597c4f61ae9515ff987b13f37e4befaeb2010

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