Malicious PDF — malware analysis report

Static analysis result for SHA-256 610ac9bde6511dab…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 22:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 03a96d9ff8c952ead975d3a781a913da SHA-1: e68cb72401349f16aa3173b03a3c7e90518217da SHA-256: 610ac9bde6511dab73015da38f2b6b0c5720bcc957f1acead5ac2cc187837aae
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the structure of the PDF point towards a phishing attack that uses a lure of interview questions to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=c+interview+mcq+questions+pdf PDF link annotation
    • https://zujafewisanepo.weebly.com/uploads/1/3/4/3/134322282/lanewupux-xivobidejed.pdfIn PDF document text
    • https://setojeduvesile.weebly.com/uploads/1/3/4/5/134587971/ee1d67592.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/ba2c0be261a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_7dd885eef66d4a78a0ffc996c7416ae3.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b9213bf8920e49c680ac001c6a6d12f9.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_490cf5edbb834338bb4531a33bc98dc0.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_a8d4191cc01743898c77fbe2c4f31b65.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_be4a71b55f3c43bd8ec6accd4ff777cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23eab4ee-ea65-4d62-9efb-2fce188d6f20/el_arte_de_la_seduccion_libro_gratis.pdfIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_e627396f45c948d684b10120dc8a72e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f0cd5e-44d2-4b55-b290-179bcff058ef/royal_crest_room_reception.pdfIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_ca7be58de80d443a826d578fdac81c52.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_b51010040c424acdaed58701b93cceba.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_00d689b695ab462cbd107bc574c01376.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_8c9a97f210734d6ba60e1f92396039c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b377e27-66f1-49d9-a250-71b80e9810a7/41435103187.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_e484db48d8c54a6fa6d3783ec7c7053e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a74ceda-a234-4021-92df-1d406a73f08f/4_pics_1_word_answers_5_letters.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_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 5240 bytes
SHA-256: f968ef7f9e52e442eebe7d7b9b3d827ba5865feacae248cb5237a3cce19a61ff
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 11236 bytes
SHA-256: 6a588c14c66c0c50f5c815b105a7896ed28c04a75c347e227b6932d9ed9cb640