Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a841639dfe05cf9…

MALICIOUS

PDF

80.5 KB Created: 2021-03-08 07:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d863050e1cc6208e95a667b593d68e8c SHA-1: 24232ac0dffcb2261555e4e9ab9e8a9cc2615934 SHA-256: 7a841639dfe05cf9961ff550b029670940367443367e2f29470409331b271110
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive content.

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://xezojetit.ru/award?keyword=how+to+get+a+wedding+dress+quickly PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481820/normal_5ff293e737ce5.pdfIn PDF document text
    • https://repitosa.weebly.com/uploads/1/3/2/6/132681506/4e1448d3d1a.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/3184529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_60220f840760d.pdfIn PDF document text
    • https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/ribepo.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/9762556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_ab40bc3b022d49b98ae9ff8f21821598.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizabo/bazaar_full_movie_khatrimaza._com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64005ca-f623-44ab-9ba3-a13e511e6a5a/bernina_1630_inspiration_plus_update_96.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f04dc23-1d84-473a-be86-8335dcfe82e0/ragexaza.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/52998723933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e69c53-c890-489f-951b-1c99da351de4/casio_mens_g_shock_mudman_watch_g9000ms1k.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_6b963692fd964009b9e5e0602e3fbe21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/tanadanewamogesanivigarob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fab3ab-b85e-4ad7-b9fc-7cfa1a020603/82080046587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8913ac12-1197-46d3-9fb2-860f23136b6e/what_to_do_if_you_lost_your_food_stamp_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a345772-a35a-426a-bbc7-e727fda56c6a/wubivoxifinexigitefunoto.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_2af9127773a84b9b94c41a60e11430a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b7e647-c937-4119-99d4-3925deb155f3/bepumogekezutunidewikazab.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_0a07d3d430594267a8305ea55b32a2cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b337b1-f6f7-4125-ac41-31e19edcf477/matonemiporunomakepi.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_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 5452 bytes
SHA-256: 82fc2511dc7ab364bb086f35f07b4be6b5b6eda21207f9f0b1599bddebccb6b7
font_01_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10148 bytes
SHA-256: 41b137376f98a08924c69b6345ee3c04e8d99eb3f491febbd7447da89a856096