Malicious PDF — malware analysis report

Static analysis result for SHA-256 d951395269701a77…

MALICIOUS

PDF

85.6 KB Created: 2021-03-26 09:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1da5a3e310c889a1d10a55ffc71395a SHA-1: b4415203f4d0e4b7b5dba35f398312524931f885 SHA-256: d951395269701a7797cc5b609acde27ddd1de71fd0dedfe06487f1e9213f7554
156 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 are dynamically generated and point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=safeway+catering+menu+pdf
    • https://porijupipisezug.weebly.com/uploads/1/3/4/7/134718457/7412217b.pdf
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/70ee2c9cbe.pdf
    • https://simiwulizolur.weebly.com/uploads/1/3/1/4/131455232/3406324.pdf
    • https://miruvoxizoxu.weebly.com/uploads/1/3/5/3/135397032/1752762.pdf
    • http://tujidal.mypressonline.com/dasonotuwigewefafefinode.pdf
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5ff9699b9897e.pdf
    • https://wukemurorafol.weebly.com/uploads/1/3/4/3/134338373/198115c.pdf
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5fe9f02e12a44.pdf
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/2184121.pdf
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/tatapula.pdf
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/4666346.pdf
    • https://rigepapesoruzu.weebly.com/uploads/1/3/4/5/134519565/a37b5832d89d90.pdf
    • http://mozobadijoba.medianewsonline.com/riduzujadova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sebokegekesuded.atwebpages.com/gigawogoregezuminum.pdf
    • https://uploads.strikinglycdn.com/files/a1581078-d7ee-42c5-8783-4ecc3732dd78/33686320283.pdf
    • http://tujetonub.epizy.com/gixebabogofepazuvimi.pdf
    • http://ronageze.rf.gd/payment_of_gratuity_amendment_act_2020.pdf
    • https://uploads.strikinglycdn.com/files/b184236b-9b69-46ca-8ecd-83a07c308b9d/what_is_the_example_of_physical_structure_and_function.pdf
    • https://uploads.strikinglycdn.com/files/dcb954da-ef0b-4c14-b438-861326a7f9b5/73211057878.pdf
    • https://uploads.strikinglycdn.com/files/7c96119b-d41e-4e81-a601-1ecd749f0495/39156873417.pdf
    • https://uploads.strikinglycdn.com/files/5d6b982a-5611-4bb6-aeee-d879cc21ea9d/dd_5e_dmg_free.pdf
    • http://moduvovujirupe.rf.gd/cambiar_de_a_word_nitro.pdf
    • http://vesedakowata.onlinewebshop.net/22495077507.pdf
    • http://sasajido.epizy.com/how_to_soft_reset_a_samsung_galaxy_s5.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010edf.bin
11c155721ddf71722474eb0da4969b45c332d4f5d5cdc055664989fa52278f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 5564 bytes
font_01_sfnt_off000121d1.bin
ccdac2cc8696e286e5f67c34903edc14d951df4a7bf45aa3c6ee8abec90dfe05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 11572 bytes

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