Malicious PDF — malware analysis report

Static analysis result for SHA-256 971db6c936773ce5…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 08:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d93ae79c38c0bfadc08a5d33a88c1ac SHA-1: b08ff687dcab4559dd863e19b095ad8d654835b1 SHA-256: 971db6c936773ce5dc212837b28046d68474ee61e65b098332b46980a1a411d4
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which appear to be generated for SEO purposes, pointing to a link farm. One of the primary URLs, 'https://botokaw.ru/strik?utm_term=refrigerator+not+cooling+but+compressor+is+hot', is likely a phishing lure or a redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://botokaw.ru/strik?utm_term=refrigerator+not+cooling+but+compressor+is+hot
    • https://cdn.sqhk.co/murefazomejo/ehdgdTt/40953782318.pdf
    • http://firstreadersclub.com/can_a_pastor_officiate_a_weddinghwvlx.pdf
    • https://cdn.sqhk.co/towevefizub/jhjcgeS/hair_braiding_salon_nyc.pdf
    • https://cdn.sqhk.co/gisatajofo/icgfWxr/traffic_road_closures_houston.pdf
    • http://acgmgroup.ru/41184747599f6f5i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fujadabez/pedipurogav.pdf
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_153a7b0d52d8476f8a0aa762c5556464.pdf?index=true
    • https://s3.amazonaws.com/regufojalojaza/do_you_capitalize_job_positions_in_a_cover_letter.pdf
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_0f8faaa2c1a64097b1442be776f6923f.pdf?index=true
    • https://s3.amazonaws.com/retisovojor/english_daily_words_used_in_daily_life.pdf
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_eb737fef3f5d4b748ca0987e219ca2ff.pdf?index=true
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_088d938f0dce4217bac071237d9c3cff.pdf?index=true
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_ad71ac2d1ea440009310ed0a45860f57.pdf?index=true
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_bfb95aca3dac419da57048f4b03cfaa5.pdf?index=true
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_c769db746a5d483598376c36ff99d89f.pdf?index=true
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_12fd4ce103154b09ad0cb78484bd8f8e.pdf?index=true
    • https://s3.amazonaws.com/setikizo/liweja.pdf
    • https://s3.amazonaws.com/magapeguwabe/fubategololanurajeligili.pdf
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_667f03dd7f6d496d81cc0821c01a9ec3.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc4.bin
edf509a1331bb1f7185de79772b08685cc32c2ecc4a73bcd2e067528e2ddd73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5460 bytes
font_01_sfnt_off0000ff2a.bin
e778b84ae41e2a0950a2efc67b9064bd2ff32aebaab7ae8f887e7fb560f2c1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 10100 bytes
font_02_sfnt_off000121ab.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 4324 bytes

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