Malicious PDF — malware analysis report

Static analysis result for SHA-256 93377e8fb27e99f1…

MALICIOUS

PDF

79.9 KB Created: 2021-04-02 09:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f7fdedb41333609bfa6737a575f2784 SHA-1: 13cf8b424b271ed74cd1d9be9d7107bdbe14f35d SHA-256: 93377e8fb27e99f1a912b13f3e7835cb7827d13e7c84b5304db3fb12e0d1214c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=toastmasters+table+topics+contest+script PDF link annotation
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/8924484925.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/arithmetic_mean_for_grouped_data.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/3328260.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/kibexegefajiwikakusar.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/pimakogazuputej_nexibuko_gubosuk.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/sulati.pdfIn PDF document text
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/7547986.pdfIn PDF document text
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/puroketomi.pdfIn PDF document text
    • https://jareruko.weebly.com/uploads/1/3/4/3/134348829/9ff67cdf.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/14407a9310a.pdfIn PDF document text
    • https://neritakewu.weebly.com/uploads/1/3/1/8/131856632/nemokogemu-kemigazinazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_b1d4905f1b07493c9065d19f6c5fa445.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_7c8665214c19426e9a54489f5cd98340.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd7d221-eea7-4716-b39a-fa7528737fb1/is_serato_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709d4756-537d-4219-bc28-1afb5be051d8/mimuwugokiniletare.pdfIn PDF document text
    • http://wilosokanik.myartsonline.com/21330095536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd064fd2-2040-481b-b5fe-a4e42a80496f/tobapotozaw.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/zumatorep.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_f510b110913849f686bb6243f791fe74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f0e411-8fea-474d-abf0-22719ee036cf/47731986532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b24fb68-85c0-4344-8449-d486e95fef80/47983346670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4825dd-4afc-4f46-a407-8a676d802353/sketchup_2015_crack_free_download_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6361ca8d-4afd-40ea-81a4-ae73d7890e72/97889845233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b924436-3128-4d76-b120-79f3e3b91c77/xuzalikakovopapoforon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 4956 bytes
SHA-256: e5b1db5efa6c015177e5cfc4c1370a932530fd85b624824d28146fabca61956b
font_01_sfnt_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 10604 bytes
SHA-256: 0e2b5553a0b57d4948fd1bc2a0102f12a4b4479e8df5b1890392a5d33a09196f
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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