Malicious PDF — malware analysis report

Static analysis result for SHA-256 784697ea1ef264cb…

MALICIOUS

PDF

70.3 KB Created: 2021-03-14 12:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65a0e22337023cad78f20d51cff64d62 SHA-1: 7cfbec9f9a523f18ae679a4457743a7b3084b373 SHA-256: 784697ea1ef264cb93f2b40ebde35ac13f0f1f9273b934d89e845079fe8b143c
156 Risk Score

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 potentially malicious domains, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=how+many+calories+are+in+a+piece+of+leaf+lettuce
    • https://cdn-cms.f-static.net/uploads/4408582/normal_604138e001f46.pdf
    • https://cdn.sqhk.co/wakewafo/jhX5iiZ/jisesepek.pdf
    • https://cdn-cms.f-static.net/uploads/4368500/normal_6037b1396023c.pdf
    • https://cdn-cms.f-static.net/uploads/4413362/normal_60495f6bd2c11.pdf
    • https://cdn.sqhk.co/ronelejibir/8ggwdAs/skater_boy_lyrics.pdf
    • https://static.s123-cdn-static.com/uploads/4379720/normal_5fdfa16153344.pdf
    • https://static.s123-cdn-static.com/uploads/4477167/normal_5fcdbb2fd8f72.pdf
    • https://cdn.sqhk.co/xozifejor/eibsgjx/srsd_calendar_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zemunomipazikez/oceanhorn_ipa_cracked.pdf
    • https://s3.amazonaws.com/jazamerijekufol/android_one_nokia_7_plus.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/13882058015.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/english_exercises_asking_for_personal_information.pdf
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_32dcca5704664ecc904166d5184d6940.pdf?index=true
    • https://s3.amazonaws.com/gapivegek/keminaluboxete.pdf
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_d5895ca866e544de814cea2e468e00fd.pdf?index=true
    • http://rameselutem.epizy.com/arthur_c_clarke_books.pdf
    • https://s3.amazonaws.com/nerugiraxura/self_certification_form_sc2_printable.pdf
    • https://s3.amazonaws.com/fejakixoweka/how_do_you_fix_a_kenmore_dishwasher_that_wont_start.pdf
    • https://s3.amazonaws.com/padanivozeb/in_s4_find_a_cyclic_subgroup_of_order_4.pdf
    • http://gogidovegesoxe.epizy.com/medical_surgical_nursing_brunner_suddarth_12th_edition_free_download.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_off0000d7ad.bin
773c0abda47710b11b3dfb588506d58fa5c574e702bf3b53ac6e96d09792b15d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 5316 bytes
font_01_sfnt_off0000e9be.bin
0f0fdccd37eced1de16818482deb4d184c9a07cff5255898f1c411b2497b6c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 9900 bytes

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