Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b54e548dfda2d4f…

MALICIOUS

PDF

76.6 KB Created: 2021-03-23 15:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b8c046cdc971defa19f436fc9cae3b4 SHA-1: 7e3b577390cf17fcc4cb21301f9dfed2a6c366b9 SHA-256: 3b54e548dfda2d4fbeb2336c620c9a6a0710adf8e89587e6ce1d47f254eadaf4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-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://xezojetit.ru/strik?utm_term=dresden+files+tv+series+reboot
    • https://cdn-cms.f-static.net/uploads/4490961/normal_602a969055bce.pdf
    • https://cdn.sqhk.co/kinemefuwa/iPD0kof/android_tv_remote_control_app_ios.pdf
    • https://wirafoxojobukof.weebly.com/uploads/1/3/4/6/134608935/vulanegaz.pdf
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5feafb8c3325f.pdf
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/559186.pdf
    • https://cdn-cms.f-static.net/uploads/4485939/normal_601cbed90e995.pdf
    • https://cdn.sqhk.co/bomoxale/chjSjoP/43581196118.pdf
    • https://cdn.sqhk.co/xevowuto/iavM7ji/moroccan_dirham_exchange_rate_history.pdf
    • https://cdn-cms.f-static.net/uploads/4376879/normal_602c1fe940e96.pdf
    • https://rinumobepora.weebly.com/uploads/1/3/4/3/134377952/nawaverimutiluvas.pdf
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/falupekagekesajobili.pdf
    • https://cdn.sqhk.co/dojozafo/oU8mjcl/gun_zombie_halloween.pdf
    • http://xipuxolidumix.22web.org/chronic_pancreatitis_diet.pdf
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/e8bae706f61b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_db6072e026cf44e8bed6bf8fb3ee9e1c.pdf?index=true
    • http://rasiritodir.rf.gd/9178276139.pdf
    • https://s3.amazonaws.com/xuvamuba/38612753965.pdf
    • https://s3.amazonaws.com/jolozidabi/jim_stoppani_shortcut_to_size_nutrition.pdf
    • https://cbc32c15-d2bb-4d0e-b575-58d83b80a583.filesusr.com/ugd/bca722_0b914b0d22e9403e9491591bce7a2f16.pdf?index=true
    • http://nijetazum.epizy.com/mezovorofode.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_off0000f0d4.bin
d431798c5724c004db937891fab4f8f373e45b2b1cf7a2e1e17c0ec328b5af2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 4888 bytes
font_01_sfnt_off0001018c.bin
b7f9a3430bcfa9aadde1fa37d51d4ff28801ba9313710616eb610d5c53708284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 10464 bytes

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