Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b94c54fd86f042c…

MALICIOUS

PDF

81.0 KB Created: 2021-03-19 03:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0d4fdaaea02d2d05fd9a888e03c99923 SHA-1: 2841f7140ec5b11213d595e7fe951c9aa5f31019 SHA-256: 1b94c54fd86f042c6be04ad545d00ad420cdc6f4d9c083eac4720f51ff594bd0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with a significant number hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent to distribute links, possibly leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://kuzutuzo.ru/wix?keyword=nd+facs+standards PDF link annotation
    • https://piriwunetu.weebly.com/uploads/1/3/1/3/131379541/muxiwod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_601e0e35d2e16.pdfIn PDF document text
    • http://menedowu.iblogger.org/2146196537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fdc16b948104.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/jerusutusolipebipagule.pdfIn PDF document text
    • https://simebofes.weebly.com/uploads/1/3/1/4/131438459/ddb4b.pdfIn PDF document text
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/nurufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_603fe375abfcc.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/28409448856.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/capture_an_entire_web_page_as_an_image_or.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/zuxefuwiteza_bugize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorasixu.myartsonline.com/zagupitezeteliwim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bf98be-997a-4acb-90fd-62f0a28c03a0/61558011548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f8f07f-f29a-4294-96b6-e008eb27dd40/how_to_take_apart_my_keurig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8acadd-474e-4a6a-b095-a77adce5baec/can_chicco_keyfit_30_be_washed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41eb25aa-2c0a-47ab-91f6-6cb218bbcfee/how_do_spell_slots_work_with_multiclassing_warlock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07588a76-4e4d-425e-8ab4-27802e373cf3/ribolerusupixoberuwin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b574c376-a632-4797-882e-2d9e12493806/34693049389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f3621f-b57b-4d53-a182-d7d4ee5da7ef/graco_4ever_all-in-one_convertible_car_seat_-_cameron_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff1e021-536a-4e9a-94c4-5b2e8604ac73/49546090106.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 4952 bytes
SHA-256: e91087953174c0c054e100ae296bca35f218661f6846492038e9c952fade9321
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10688 bytes
SHA-256: a121ff620902f8a81f4bd65f943461d7c64a597a37108cddc0bd789f08773f02
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15