Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabd4d8097730b1e…

MALICIOUS

PDF

80.9 KB Created: 2021-04-17 13:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1210a0f9c0a4d691ce64b2fba82bd7a9 SHA-1: 5fdda722ab0fb898c17fa5f0ab0c69e622b91e0e SHA-256: aabd4d8097730b1e2e31bafc4e7ebb4bc59285f167cf807885575e0b588f9092
126 Risk Score

Malware Insights

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

This PDF document was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to 'zajinet.ru' with a 'skyrim how to get 100 enchanting' query, indicating a lure to attract users. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, potentially leading to further exploitation or phishing.

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.
  • 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://zajinet.ru/strik?utm_term=skyrim+how+to+get+100+enchanting PDF link annotation
    • http://kawafopi.mygamesonline.org/56652101351.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/rixavakive.pdfIn PDF document text
    • http://serovakarara.mygamesonline.org/kalnirnay_marathi_calendar_2020_download.pdfIn PDF document text
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/jefedozanoni-kipozinasanonas-dobiriwejakoxal-jonunugezipodib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_b7122572f0514850a4402ed151822902.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a090cfb9-8bd4-42fc-b26f-bb288c4a287e/tufuvorajawenapozano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649334d5-e2f0-4062-af84-dd17a829bd4a/panasonic_tc-p42x3_specs.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_d912e20f788541c4ab1ff1a38e60f75c.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_ca6e98b67b364869b8883f193a1a8b5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bd6b74-8f86-4007-8ee7-ce427a1304f4/nekalejetimuje.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_1f265bc5be544425b8a0c8cbd81701ed.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_46e13cfc728d472395ff8430198bb660.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_5399a39c12b948c89364a0a67a325476.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_3cf3137ed7e8431081819cab1d069e9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donarepemi/informatica_aggregator_variable_port.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abaf57c3-a149-4107-b85a-6de5f96afe3e/how_to_write_an_equation_for_a_trend_line_in_slope-intercept_form.pdfIn PDF document text
    • http://lenofafezanobu.atwebpages.com/pixijivuvibapoxad.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/toyota_avalon_2015_user_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 5556 bytes
SHA-256: 69757777e8b8989bb323c52a4fb2fbed18e37148dc2a06ee73f6d8d7a285052c
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 12248 bytes
SHA-256: 388700042c9a16312ccf558abf6d806f9460f048ac91fe71ae5b206d63b173e6