Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b7160bfe5684cb…

MALICIOUS

PDF

77.1 KB Created: 2021-02-19 12:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5518014ea9e4a4c1c37945b986c9c8d8 SHA-1: 96850c70316c14a9a258c0549f3243b7705c0336 SHA-256: 04b7160bfe5684cb68d053181150ce12d692ebbff3307eacab005b1ecee435f8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to a PDF link farm containing numerous external URLs, suggesting a tactic to manipulate search engine results or redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=masterbuilt+44+propane+smoker+parts
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/6013483.pdf
    • https://xuwajaxupix.weebly.com/uploads/1/3/1/4/131407635/modoxe.pdf
    • https://static.s123-cdn-static.com/uploads/4446759/normal_5ff347c7a8999.pdf
    • https://cdn-cms.f-static.net/uploads/4500432/normal_600d68d7f1708.pdf
    • http://vadakob.22web.org/36662464067.pdf
    • http://potobol.22web.org/zutukupujarezer.pdf
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fc691cda88e3.pdf
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5fd75d63002ef.pdf
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5fdae104bf93a.pdf
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/4222467.pdf
    • https://static.s123-cdn-static.com/uploads/4386834/normal_600106704b964.pdf
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/gasevafeja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/roware/73368790889.pdf
    • http://gugujis.epizy.com/nifejofivegux.pdf
    • https://s3.amazonaws.com/sagotomagin/solone.pdf
    • https://s3.amazonaws.com/dowadotiju/45729042785.pdf
    • https://s3.amazonaws.com/nelizenejakarug/addition_and_subtraction_worksheet_year_2.pdf
    • http://ritanuwo.epizy.com/mufofofepetokugoz.pdf
    • http://bomesesif.epizy.com/cs_go_aimbot_wallhack_free.pdf
    • https://s3.amazonaws.com/kikunojulejuj/bsplayer_pro_2._70_serial.pdf
    • https://s3.amazonaws.com/gagagakigibapo/49427390145.pdf
    • https://s3.amazonaws.com/gumegulaxi/93506185591.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d1.bin
6f6c5a8fb5e62cfd2b6ff76f758e0f05a98695d5bac735cd019a42cb5e5649ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 2952 bytes
font_01_sfnt_off0000e45e.bin
ebf0de8c1cd6fa9b584545ec8d260c08aa4ef676d069bd2fc4ef68a64ab89ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 5260 bytes
font_02_sfnt_off0000f631.bin
d986dd8b2b7f8ba34b6408f13f74cb39ba8ce19a68654f83b314fb221c7604fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 2352 bytes
font_03_sfnt_off000100d2.bin
3008db9d7f17f2a8b02f0046b2fd77dc5c7ef5fe2f8264a471dfd6327db91fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 11016 bytes

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