Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1f08b941d8bdf9…

MALICIOUS

PDF

95.8 KB Created: 2021-03-09 08:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 01c979cbb71f8b91e03a32d00edb8144 SHA-1: c3d9b97631b8f729d95f8e6bb5b6be59f3b922e3 SHA-256: dc1f08b941d8bdf95a2bc77dc28b70867c9962d0cb1dc7edbbdf528b7be5c6fd
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/123?utm_term=acls+guidelines+2018+aha PDF link annotation
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/xividox-sagomo-riritajoxujol.pdfIn PDF document text
    • https://dilemawusufugo.weebly.com/uploads/1/3/0/8/130874642/bekari.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/1c2b3826.pdfIn PDF document text
    • http://samaraexpo.com/pixuduralafid4tz56.pdfIn PDF document text
    • http://didazema.mypressonline.com/xizawevom.pdfIn PDF document text
    • http://arthromedshop.xyz/which_of_the_following_is_the_energy_of_a_moving_object860pa.pdfIn PDF document text
    • http://cetly.xyz/sekiro_isshin_boss_fight_guidel7dq8.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/management_science_the_art_of_modeling_with_spreadsheets_solutions_manual.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/takujutusuviguzofop.pdfIn PDF document text
    • http://shop-onlain.fun/varowutobn4ilg.pdfIn PDF document text
    • http://oyuncuxx.com/zokobejitomujhgu8.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/mepugobe.pdfIn PDF document text
    • http://lastmarkt.ru/969437220000rghs.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/1781011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/223e49da-36cb-4516-994f-d75542425490/94531724439.pdfIn PDF document text
    • http://dotopaku.atwebpages.com/jirix.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_1332252ea0ef4ea6b2a355dbb28f96d6.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_39a664881c3745afa71402b1aece34d1.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_84ca15e1ccf94b56ab73aecc923eebd8.pdf?index=trueIn PDF document text
    • http://nedizilunok.myartsonline.com/47598551036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f702f0-0e4c-45da-b93a-d1423bdcdf41/ms_excel_2007_formulas_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac930b04-e580-4d27-a86d-45b58165e770/monster_illuminessence_remote_not_pairing.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_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 5612 bytes
SHA-256: 388f7b6dae1f09ef9f374c392c2da3da9623e36ae831092376f6f8753273c1ad
font_01_sfnt_off00014b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8B 11792 bytes
SHA-256: 16b61cb13407d46dfb4ceb4598d793bb6a4c45f3ee5ac3159231a91c7c43ab2a