PDF malware analysis — malicious · f2bb0d75e8fd3d8a

MALICIOUS

PDF

87.9 KB Created: 2021-03-29 05:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 3db84f9e217c465b90b3c477f52fa861 SHA-1: 0222038de52e629d71788ba9cf449c53afa52a67 SHA-256: f2bb0d75e8fd3d8a581faff3427e564a18026378e967901bb9d2cbea53b66718

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. It contains multiple external URIs pointing to potentially malicious or unknown domains, suggesting an attempt to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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 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://jacksth.ru/award?keyword=arabic+pdf+characters+are+disjointed+and+reversed PDF link annotation
- https://dujaporugegebo.weebly.com/uploads/1/3/4/3/134314108/kepipatifoki-ruregazupepi-berur-bavap.pdfIn PDF document text
- https://cdn.sqhk.co/remezebona/Yjdif6r/nail-_biter_meaning_in_chinese.pdfIn PDF document text
- https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/wuwunubipu.pdfIn PDF document text
- https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/13fa59fad81c49.pdfIn PDF document text
- https://cdn.sqhk.co/zoluxoni/Miiihic/zudeluko.pdfIn PDF document text
- https://mosawowogan.weebly.com/uploads/1/3/4/5/134511341/sofobo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/tunenijexe/dyke_delta_pilot_report.pdfIn PDF document text
- https://s3.amazonaws.com/tezofuretejom/ralezunujogaxusezapotuwin.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/419fc140-44b9-46ab-9547-b28beb966f0c/dell_optiplex_7020_i5_release_date.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0095e226-4f6d-4547-b51f-7f5a8a7d5198/how_do_you_fix_a_broken_charger_port.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c7e4678a-b020-4b77-904f-e05359ee44aa/vavefojile.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/05f5921b-32e7-4e32-99d1-66529d7c66e9/how_to_get_bombs_in_breath_of_the_wild.pdfIn PDF document text
- https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_5b63580a6eb248c4aee6b5cde6cb3857.pdf?index=trueIn PDF document text
- http://runatavakez.epizy.com/fleischner_pulmonary_nodule_guidelines_2017.pdfIn PDF document text
- http://rivejekab.epizy.com/jurnal_bioplastik.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0f4fa840-22ac-4dcb-9e28-2411585dbfa0/92195164084.pdfIn PDF document text
- http://telijurubora.rf.gd/flavour_crazy_love_instrumental.pdfIn PDF document text
- https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_2fc35624237e43a2a5e926d2632106df.pdf?index=trueIn PDF document text
- https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_bb861a4a24a04bc79fe384648e0f57bb.pdf?index=trueIn PDF document text
- http://rejekokamikax.rf.gd/jiwowaw.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000124cb.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x124CB	24700 bytes
SHA-256: `9a0606f6de5b06790ab462184eb601cfe0ae6e572a9223612bbed96d08b1739f`
`font_00_sfnt_off0000eba0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBA0	5476 bytes
SHA-256: `11466313b557a08f3fa32379d66c7f05dcfaced7e8161203f04584f0a1fd90e3`
`font_01_sfnt_off0000fe41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE41	11172 bytes
SHA-256: `62e077a3eab6a25a16f5dde9de7115a5e5ae2302f9cd30a145736d67112378cb`

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