Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c73d00523aa89f2…

MALICIOUS

PDF

73.5 KB Created: 2021-03-05 04:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 54ccef0812ce51e17121ed53c25613bd SHA-1: 5b995225ebc6ac3b3adbc1a2104dfde9c8673997 SHA-256: 6c73d00523aa89f2a6c5b403a93129d040289aab99d54fb703d0adee5eaa4eb0
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs on disposable hosting further supports this assessment. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://dugedepap.ru/123?utm_term=sonic+diet+coke+nutrition PDF link annotation
    • https://cdn.sqhk.co/zolewiko/Imhi6or/36218926173.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/axDAhar/winklevoss_brothers_bitcoin.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/fugazufodeka.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/gh7gfge/zukugugotasifobulodamiw.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/gggirJY/faliseradas.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/kanesudusiwarejimefe.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/ariens_snowblower_carburetor_repair.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifimerin.onlinewebshop.net/63341653300.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_6e825699f7824cd7a439bdbc7af6f7df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/tobipiganuguramonijovos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eba8ed7-6f37-41ac-b760-c6e8f07755b1/13657805886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5573c1d9-f766-4922-9368-fbd3927b7901/40520738500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74f5c24-5c18-49c4-8aab-3b493a9df059/how_to_troubleshoot_ac_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d5ffb1-9fa9-46db-8942-afa5fe750e19/bibexorojekop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924bd494-9a26-456d-b245-747438091a26/what_are_the_7_principles_of_the_data_protection_act_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/mezorumiwenimuf.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_247d5caddf3e4b24893679a62a663bd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/patikeloli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a488eca-9f28-46d8-9ebc-40cda62406ac/one_meal_a_day_fasting_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca45364f-a641-417c-aa82-6fe08a923d81/fusuz.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/63409158460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc05a77-1c2a-4ea7-84c7-7bf4030ab0c6/14626174734.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/25478919198.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_929a249658d7419e82e13055d0143d73.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_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 4680 bytes
SHA-256: 2025e7830c6d47d35e57cb0127b3309cf4f0287c2ed67ce70e494722fd149c77
font_01_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 10948 bytes
SHA-256: 4693504506768be4f99c55d6b5328ff90877a0553ce7b6e11e159da406bc3bef