Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dedf3f124ffd586…

MALICIOUS

PDF

75.5 KB Created: 2021-06-02 16:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1decdabecacc3460cbbec8590ee270d5 SHA-1: 115aed96a7791ca5df31716d796c6a958224c321 SHA-256: 7dedf3f124ffd58610768b46a83a09aeebd622034833ec1667917d962f8f6f5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a large number of external PDF links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://queure.ru/pbw?utm_term=can+you+prequalify+for+affirm' directly supports the phishing lure described in the attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/pbw?utm_term=can+you+prequalify+for+affirm
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/kulodevagosofupojefo.pdf
    • https://solovetimu.weebly.com/uploads/1/3/4/8/134879252/0733ec2fd7653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wenuveraroto.pbworks.com/w/file/fetch/144506799/90149891352.pdf
    • http://betosaxugawi.pbworks.com/w/file/fetch/144469731/50381369038.pdf
    • https://uploads.strikinglycdn.com/files/1080db0c-687b-4f5f-a9e9-c7bf44063feb/98837327013.pdf
    • https://uploads.strikinglycdn.com/files/c6f62b46-2392-4278-86cb-eb12268b1745/pofomatapazasibufutexure.pdf
    • http://tagexoba.pbworks.com/f/38536935039.pdf
    • http://mujusevo.pbworks.com/w/file/fetch/144455673/kotegunepelamori.pdf
    • https://uploads.strikinglycdn.com/files/ed78deb3-c5f2-4051-a89f-f023a49022b0/1329149687.pdf
    • https://uploads.strikinglycdn.com/files/d4ddf148-88de-4579-9bdc-fb1d5e95587f/a_different_mirror_takaki.pdf
    • http://risoxef.pbworks.com/w/file/fetch/144466581/41185344917.pdf
    • http://lekipirunezi.pbworks.com/f/77876977449.pdf
    • http://wuxikadafi.pbworks.com/w/file/fetch/144414201/resignation_letter_format_in_marathi.pdf
    • https://uploads.strikinglycdn.com/files/7862f69f-6768-4fa0-ab27-41290651cf59/microsoft_access_error_2761.pdf
    • http://vatojorisa.pbworks.com/f/exerccios_adjunto_adnominal_e_adjunto_adverbial_com_gabarito.pdf
    • http://wiwedano.pbworks.com/w/file/fetch/144427773/33357421382.pdf
    • http://kivupored.pbworks.com/f/natifiwiredufenuwibaxolu.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_off0000e9af.bin
3a45f7888ea6c7c3aa28b50e903420295ccb3b905b1e3cc9e9d7254bb4c6add0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 5000 bytes
font_01_sfnt_off0000faac.bin
82f9dedc9da5af69ea6b7be7a787b72fb07c460e48e30581d614a9f0d788455c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 11328 bytes

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