Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd4f4fadfcb66f1…

MALICIOUS

PDF

126.6 KB Created: 2021-04-21 23:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6be115bf22adba8182a85e425891394d SHA-1: 734083eba28f1beec0663dd03eb34fc8a95df8ec SHA-256: edd4f4fadfcb66f139849b1cdf89c7c675cd86ee2f8952ea0d4cc900e66f9548
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and uses a lure related to game cracks. The heuristic 'PDF_SEO_LINK_FARM' and the presence of a URL with 'utm_term=mount+and+blade+warband+no+serial+key+crack' strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ClamAV detection and ML classifier indicate malicious intent, likely involving redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xajibur.ru/strik?utm_term=mount+and+blade+warband+no+serial+key+crack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367304/normal_600db673e386e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5ff024ea9ff9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_60104b4a2cb52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_602392898c34e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_601908031a159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_603c68f6ac39c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5fe30bab68a4a.pdfIn PDF document text
    • http://xovonakajo.22web.org/20636759854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60460605d6a46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fee88f2e5c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5fd8d15993bdd.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eba09e2-86d6-4094-9cc2-27049dc15571/74292678517.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_ff9ed3766ce4483fb0628978c7b4ea20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81fdd14-6caa-4e3c-b9ce-1ea518c14b47/what_are_the_common_properties_of_transition_metals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417a759d-16a0-4d86-87de-eab213f9b310/pumalorijesutet.pdfIn PDF document text
    • http://wosumobikufiw.rf.gd/bully_obb_mod.pdfIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_86ae17e2f27a49e1ad315284fb7bb490.pdf?index=trueIn PDF document text
    • http://bopamebedozupux.epizy.com/just_dance_2014_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3e349f-001f-45bd-864c-b8bc1ddef9db/59826980194.pdfIn PDF document text
    • http://zarusorujot.epizy.com/28713980776.pdfIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_fceb8aa3b0ba455d92505131d896ed40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/529b8140-7322-40b7-b23c-05fc9d8ef631/dias_feriados_2021_puerto_rico_oatrh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d664fd9-4667-4d18-9574-aca27e9b962b/sears_12_inch_band_saw_manual.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017c2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17C2D 11996 bytes
SHA-256: 3dcea6169bdfee1403e983395ad1c31fc67c23388ae56e97c7a25994fd1a06ab
font_00_sfnt_off000169e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E3 5336 bytes
SHA-256: fe22c7d7abf259c60db30ab81bb1a0ad72bab9655dc987d44c7ebfe7a6ce2886
font_02_sfnt_off00019e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E2A 16344 bytes
SHA-256: 17fbadccec30db2a955dd846dbac55d345343b567211d48e39cb75f7a965b68c
font_03_sfnt_off0001d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2A0 16692 bytes
SHA-256: 942708fa329a5d680adec91269db8102b250e1a1ca3c997efb1f7d51170fdff1

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