Malicious PDF — malware analysis report

Static analysis result for SHA-256 347e8c3e0ff181e1…

MALICIOUS

PDF

80.0 KB Created: 2021-04-21 01:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdf0be55bb42d182457b9e988dbb1387 SHA-1: 5a48fab91f9632c62299d736d19200b0b7cdad17 SHA-256: 347e8c3e0ff181e12f57b859f316adbb1e279e8ba43120ad0b960d3784659c30
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive link farm is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://ponafet.ru/strik?utm_term=star+wars+thrawn+audiobook
    • https://nudametuwino.weebly.com/uploads/1/3/3/9/133997501/vetagatidiriwok.pdf
    • https://cdn-cms.f-static.net/uploads/4413002/normal_604d2ef06993f.pdf
    • https://kifakofaw.weebly.com/uploads/1/3/4/0/134016777/2713065.pdf
    • https://cdn-cms.f-static.net/uploads/4381536/normal_602c5b7127d3f.pdf
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/kisef.pdf
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5ffd533e49c32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_8ecb637a6cf8450e813086e5e4a49a93.pdf?index=true
    • http://fereralud.epizy.com/53721879388.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_fc4eea314a20410f9f3261275721a66a.pdf?index=true
    • http://taxifegizuni.epizy.com/98226738562.pdf
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_1542be929f2b4d6a9c076e6cd84f2429.pdf?index=true
    • http://rolugume.rf.gd/how_to_get_ny_drivers_license.pdf
    • http://lofadezowudekeg.epizy.com/65184961862.pdf
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_b42a7e6ee18c4765863ed5a0b447dba2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81b26ff3-3be6-4fcc-8c4c-c21b8511d0d9/how_to_stop_global_warming_as_a_kid.pdf
    • https://s3.amazonaws.com/gotenukevepunin/antimatter_black_market_enlightenment_free.pdf
    • https://s3.amazonaws.com/gavapozalilup/ubuntu_server_guide_for_beginners.pdf
    • https://s3.amazonaws.com/kijelopazekune/what_kind_of_heart_problems_cause_high_blood_pressure.pdf
    • https://2d66045e-c276-4037-81df-184b25840e97.filesusr.com/ugd/cdf3e3_95f18e3d26864924b5ccec4152acded4.pdf?index=true
    • https://s3.amazonaws.com/zafibimutadoti/21416271203.pdf
    • https://s3.amazonaws.com/lanaladu/tefapawirizilidavuvajawo.pdf
    • https://uploads.strikinglycdn.com/files/1a557859-e1db-4be0-b130-7bfa6436b0de/6385930974.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc2.bin
62550528323c79a9de7fb3f33f8f96cbde0d9762d4617227b15a9044364a65f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 5280 bytes
font_01_sfnt_off00010dbe.bin
31925268ccd018bfe5d0bf750bd76ef989719ecd7fd77a3765bbc2c6ad5a35bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 10904 bytes

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