Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bce87f3e62a52e3…

MALICIOUS

PDF

79.1 KB Created: 2021-05-28 01:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b334321e3626cf5e08bc1aa692416cd1 SHA-1: d479aa7b44afcb23e7d05caa3e15bc2bee6ac982 SHA-256: 5bce87f3e62a52e3a8f92d2a991685069187b9a2f92a684a2decec26757fb856
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, with the PDF_SEO_LINK_FARM heuristic confirming the presence of numerous external links. The embedded URL and the document body, though partially corrupted, suggest a lure related to 'how to set temp on keurig elite', which is likely a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=how+to+set+temp+on+keurig+elite PDF link annotation
    • https://likotemeg.weebly.com/uploads/1/3/4/4/134464786/giwupolinunirodat.pdfIn PDF document text
    • https://verobegami.weebly.com/uploads/1/3/0/8/130814611/369c5a4aa5f.pdfIn PDF document text
    • https://surarapumo.weebly.com/uploads/1/3/4/3/134305151/7bf8fb64be67c.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/8068506.pdfIn PDF document text
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/sukukedofomur.pdfIn PDF document text
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/6540953.pdfIn PDF document text
    • https://lixemuvoxowogod.weebly.com/uploads/1/3/4/8/134878154/lagegadabatirudi.pdfIn PDF document text
    • https://jibijuzevigux.weebly.com/uploads/1/3/5/3/135333604/bixegedugafa.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/bf2399d45fdda.pdfIn PDF document text
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/werawofometeb.pdfIn PDF document text
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/puxofizusekapi.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/vopugikoj.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/675278db-f4ab-4691-a2a9-8fa6aa8b1895/thinkscript_fold_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb75d491-c7a0-49c7-9cbd-d4162935c7aa/combining_like_terms_with_algebra_tiles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9f1609-bfce-4a68-adbb-e72cef9fdf51/procreate_tutorial_illustration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcc3162-34f3-428e-852d-03cfaf941794/honda_shadow_1100_carb_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a2b0d2-f363-4bb8-a51c-908e70f74032/what_is_the_difference_between_homologous_and_analogous_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9437eee7-b657-4c99-9df1-0063ba54cf64/jogemowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68803b4f-b646-4c7b-90a4-bfa90226909f/gudifizumuwavazuxakovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23023920-e34c-4890-92d0-2a12387516c7/suvejefijuzofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23eae498-8073-4a39-8ddc-53be1668add1/cramer_84_studies_para_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24998ce7-fa8d-4c57-b061-5e6fd70c792a/state_the_5_principles_of_natural_selection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6ca2e7-eb8a-4724-98bb-7331f8ea9ba0/unix_shell_scripting_tutorial_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9cfa753-661e-4bd2-ad55-a8e768bd0db0/14469453436.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_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 5048 bytes
SHA-256: 3c8fc826dd58c585d70603190ef7f89fb92b8ca2fdd60246b4c1314814cc36ce
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 11412 bytes
SHA-256: af6f80208352c78291794032d968f4059baaadcf8bed171b833afd2508a234e8

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