Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e1f420dcc6795e…

MALICIOUS

PDF

75.5 KB Created: 2021-04-17 13:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1c281d0424a6c6c75807bffcd4d2955d SHA-1: b574f13e00092b41f0e0f45d1ccf0c055c8024e8 SHA-256: a8e1f420dcc6795e0222efdff03440cba3237afad3208e9eee2b768401f0ba03
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=how+to+use+dos+commands+in+windows+7 PDF link annotation
    • http://duwinijuj.mypressonline.com/78908982467.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/cowboy_havamal.pdfIn PDF document text
    • https://dimawirosaj.weebly.com/uploads/1/3/3/9/133997296/1196101.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/sewovifisonikap.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/casio_edifice_ef_550_manual.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/alter_ego_plus_a2_cahier.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/canon_eos_t5i_lenses.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_6171b88761084146a7dd630c36f181ef.pdf?index=trueIn PDF document text
    • http://pixagikaw.epizy.com/risk_management_matrix.pdfIn PDF document text
    • https://9d03b195-5c34-4993-8a23-519dd2bddccd.filesusr.com/ugd/9ac058_eb46f920d6ad411683cb753a6925459d.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_8b76776eae0b4957b43b424ea679e174.pdf?index=trueIn PDF document text
    • http://bufiziwo.rf.gd/dufubegelepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fce9018-52de-45d0-966b-10138655eb77/penny_stocks_to_watch_today_benzinga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e224abb6-88e1-4997-afe6-2f07d19a4bb5/28384680508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac587558-8fb1-491a-94c7-47b32d9afaaa/the_exorcist_3_jumpscare_gif.pdfIn PDF document text
    • http://garafukaralefa.epizy.com/fetexaferux.pdfIn PDF document text
    • https://c9ecad83-e70d-4e71-84d8-0086c45344aa.filesusr.com/ugd/01a317_3ea0ce547162400c8846044fe73c995d.pdf?index=trueIn PDF document text
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_6dfb10b1618c44ad9f5c1ef900d87855.pdf?index=trueIn PDF document text
    • http://napuganenafu.rf.gd/20119783902.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_00bc041569eb41ea9e06a59b869d03e9.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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 5088 bytes
SHA-256: f1cf07619a58f8d032650d7833e64e4e1533b8a302eaa1feaae23f6a20f3ee60
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 10820 bytes
SHA-256: b4d4eff9d048043bb413bd76c37ed1a89cf7284849cb2fe1c3cab18d265a40b5

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