Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee81fc87367a7bd…

MALICIOUS

PDF

83.2 KB Created: 2021-04-27 20:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ba35981ab7e5e1a37fc2fc1d4255032b SHA-1: 73a7e7b9a1074929851a19c36b12cb1d3fe0684b SHA-256: 6ee81fc87367a7bd64958528531d94602d5ff4fdbfbc4519e958a96a6478f232
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, many of which are hosted on disposable domains. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used for phishing or distributing further malware. The presence of external links suggests an attempt to redirect the user to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/strik?utm_term=free+online+romance+novels+download+pdf PDF link annotation
    • http://lirinevewafa.mypressonline.com/10581193993.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/a8hlpZ3/99632738135.pdfIn PDF document text
    • http://bapulesaj.mygamesonline.org/vemon.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/q9yghgd/csr_classics_hack_mod_apk.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/vuxip.pdfIn PDF document text
    • https://rabinuzigiv.weebly.com/uploads/1/3/4/7/134737829/a587ec72ba844a.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/file_ti_v_khng_in_c.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/telugu_vowels_and_consonants.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/3IhjtSQ/turn_off_lock_screen_time_iphone.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/5633649.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/vofer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_8b94a6751542452992a3649243119b6c.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_36cd935dca274c238b49729e46eba124.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_325be161e7ca4bfc9a81a776ae60a238.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2edd6c27-4141-40f5-a7a5-a0276e895b17/harry_potter_and_the_chamber_of_secrets_book_summary_short.pdfIn PDF document text
    • http://fabevax.myartsonline.com/63051174724.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_92b088108bd044d2a2c87bda2568a111.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82bbd03-583e-4118-ba71-99d698d08156/how_to_read_body_language_if_she_likes_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e95eb86-a468-4aee-b40f-94e56dd7226a/nizavovewab.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_8f0f1ba07d264cb085129429266235ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a89525-41d4-48c5-8814-fca4fbde25f0/mugamepimidaxajevojes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab893246-36d4-4eca-bf79-b3b92a805351/29829386272.pdfIn PDF document text
    • https://73751e13-14fc-4cd6-a59c-4ddde11e8b30.filesusr.com/ugd/f96b02_15f2c1eece864215a23893dbb05ad478.pdf?index=trueIn 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_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 5408 bytes
SHA-256: 31d38361ac94050ac690930ef1e9c65e3949404907fe8415d53d13c3cbe1c13e
font_01_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 11888 bytes
SHA-256: 0c1a249a00bda988a9f5efb2c8c74c5645f1546e59a8b687b5395b50a5897fab

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