Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd79b64df42088eb…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 00:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9e3e6ac6908bbe4a0cd7df56e98bb31 SHA-1: 6176efb5f79c4efbbc7872f032543ce87058dc61 SHA-256: dd79b64df42088eb2c55d2000979c0e34bd003b00893381f72e216d2e735cdc1
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 are to other PDFs, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://leonvi.ru/123?utm_term=book+cover+template+latex
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/c8a495535.pdf
    • https://rorekejufekate.weebly.com/uploads/1/3/0/7/130740186/9963775.pdf
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/33e29abf7d9d450.pdf
    • https://dokupikojezox.weebly.com/uploads/1/3/4/7/134740590/woxusu-tilamu-tomosuje-xorojoj.pdf
    • https://xawuvokepixa.weebly.com/uploads/1/3/4/6/134617960/8502032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/849ec14e-4c33-4009-b88f-3b51f2925ea4/adobe_premiere_pro_cs6_tutorial_in_hindi.pdf
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_17fed325ba6049ad904d5a8595d50b02.pdf?index=true
    • https://s3.amazonaws.com/tapexiw/how_was_caprock_canyon_formed.pdf
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_4e2b93bf5d3b4eb0b64f911f88d22233.pdf?index=true
    • https://s3.amazonaws.com/fotojipifuzitul/bitvise_ssh_client_7._15.pdf
    • https://s3.amazonaws.com/wamatasamegu/5485156346.pdf
    • https://uploads.strikinglycdn.com/files/ebc55f28-ce73-4858-8397-806d9faca3d3/basogoxug.pdf
    • https://s3.amazonaws.com/sitok/how_to_connect_both_jlab_bluetooth_earbuds.pdf
    • https://uploads.strikinglycdn.com/files/c5f21f17-99d3-4a7f-a77a-902d944d4f16/how_to_fix_mouse_not_working_on_minecraft_ps4.pdf
    • https://uploads.strikinglycdn.com/files/be63da42-e56e-4875-bace-a6ba22d4dab6/how_to_cast_disney_plus_onto_tv.pdf
    • https://s3.amazonaws.com/memobofilenabon/baritiliranorabev.pdf
    • https://s3.amazonaws.com/sudevejerifu/xexisojadijujimemot.pdf
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_2c38792e59514f308d757c15d6dce972.pdf?index=true
    • https://s3.amazonaws.com/tugumeb/how_to_prepare_for_a_nursing_group_interview.pdf
    • https://uploads.strikinglycdn.com/files/95db1ce7-ee17-4423-9a78-7b3fc821577c/30520788677.pdf
    • https://uploads.strikinglycdn.com/files/b20c55f5-3543-4000-bd3f-527b4334e177/the_logic_of_violence_in_civil_war_kalyvas.pdf
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_a8348d2cb2df402faf6951c1c5cef01a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f9f75ac-be44-45a4-be77-09560d019db9/fender_hot_rod_deluxe_iii_limited_edition.pdf
    • https://s3.amazonaws.com/nemafu/characteristics_of_a_good_marketing_research_report.pdf
    • https://uploads.strikinglycdn.com/files/827ac957-05c5-4888-bf9a-5970e17b8206/is_he_dipole_dipole.pdf
    • https://s3.amazonaws.com/jewizopukuni/7330104144.pdf
    • https://uploads.strikinglycdn.com/files/0cc879a0-a966-494b-9a66-aa10ee1fe741/petsafe_wireless_fence_operating_and_training_guide.pdf
    • https://uploads.strikinglycdn.com/files/3063a7da-88fe-4d8b-99b4-e0de92f829e2/94402132913.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_off0000f6a6.bin
47048456d7006f356bb56044a9a13d4bb1152a8476a7b9d65512748cb0f65655
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 5140 bytes
font_01_sfnt_off0001081c.bin
e9f91afe63fead43525a86419dabe73df67e5c2feeff623b8c1ab30c4122fb07
pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 11800 bytes