Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c20dcd1528924a…

MALICIOUS

PDF

70.6 KB Created: 2021-05-23 05:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c150eef2fc539e4fefe319cb293d6f25 SHA-1: 61f402fbab67abed0b08b236b14aa6b3e214b7d5 SHA-256: 41c20dcd1528924ac238d4e9f59321936ee35f0964e7577ca97b22f4e632d92e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crophysi.ru/strik?utm_term=island+biogeography+lab+answers+apes
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/f7499c4.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/jedukakasuxorof.pdf
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/ralajanite.pdf
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/a51400.pdf
    • https://rimedugomo.weebly.com/uploads/1/3/0/7/130740195/wofurituni_sunosaw_mexokeluwi_zamezi.pdf
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/c1e6db2.pdf
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/5722436.pdf
    • https://sakiverore.weebly.com/uploads/1/3/6/0/136095660/wotomuminixo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1bd14166-df67-4b79-b2dd-630287f1c1e2/dixotivonixijesekonaga.pdf
    • https://uploads.strikinglycdn.com/files/eddbbe06-cf46-4fe8-80f3-39d2997e5819/vc_andrews_heaven_full_movie_online_free.pdf
    • https://uploads.strikinglycdn.com/files/1a288ae7-27e7-4f75-a437-909a68ffc22f/tibudagatuwitifiguravosa.pdf
    • https://uploads.strikinglycdn.com/files/233d79e1-d450-45c3-9aaa-7875a8e5e1ec/91959912358.pdf
    • https://uploads.strikinglycdn.com/files/6f5ae844-bf34-4765-9973-242f0dbcb40f/78074616275.pdf
    • https://uploads.strikinglycdn.com/files/57641fc9-269e-41a3-9711-5b151a9571e6/97903781623.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/duxuv.pdf
    • https://s3.amazonaws.com/sefiwegegagu/how_to_stop_climate_change_as_an_individual.pdf
    • https://uploads.strikinglycdn.com/files/f4af3115-d9ac-48fb-bdaa-a40b0c1b7041/the_sims_3_world_adventures_download_apk.pdf
    • https://s3.amazonaws.com/sesafefanulokam/catalogo_cucine_ikea_2018.pdf
    • https://s3.amazonaws.com/lupuvogotog/deutsche_floating_rate_notes_factsheet.pdf
    • https://s3.amazonaws.com/jepinebawo/minikorijilenilidota.pdf
    • https://uploads.strikinglycdn.com/files/219f9ae4-90b0-46c5-9e5d-c8eb53ea40be/quantum_field_theory_in_curved_spacetime_and_black_hole_thermodynamics.pdf
    • https://uploads.strikinglycdn.com/files/328a100d-6df3-48b5-9817-bdc6fee79f45/how_are_the_bible_and_torah_similar.pdf
    • https://uploads.strikinglycdn.com/files/199ed90d-cf44-4239-971a-7c758c0fd833/who_is_the_outsider_in_the_outsider_stephen_king.pdf
    • https://uploads.strikinglycdn.com/files/d65aa1ee-cb10-4775-b1f8-f93e6e903358/15884477043.pdf
    • https://uploads.strikinglycdn.com/files/e696072b-8a10-4b62-ab1b-4e6310d761e5/24214835031.pdf
    • https://uploads.strikinglycdn.com/files/4f7cfbc3-dc40-4c25-baac-5e754ef39ff8/ruxunukim.pdf
    • https://uploads.strikinglycdn.com/files/68d02fd4-7df6-4b0d-b58b-0be2af3e335f/miwelas.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_off0000d72d.bin
0f63c059193bc0340ff257c7da5fcfa7060f5b68383628e850c8c11d149f6706
pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 5492 bytes
font_01_sfnt_off0000e9de.bin
d3b94bcedc1429a9b69e2a98c2121931b552f93a02ae7658e0a175073ce814dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 10224 bytes