Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25aa63490572580…

MALICIOUS

PDF

68.5 KB Created: 2020-12-20 09:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f8f8c0ea60ef579f4e5a491c9eaef80 SHA-1: 35f48e9570fe46870d6499b4627003c6f7cbbd8c SHA-256: c25aa634905725804eff51869b5e8347fede0b45ecc03be54590eb1405ab854d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by multiple heuristics, including a critical finding of it being a PDF redirector link and a PDF link farm. The ML classifier also strongly flagged it. The embedded links point to suspicious domains, suggesting an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/strik?utm_term=mass+of+the+nucleus+is+closest+to
    • https://doxazijizule.weebly.com/uploads/1/3/4/6/134640144/puvasojeloz-basap-sajorug.pdf
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/fopokosubegaramog.pdf
    • https://nifadajenekipib.weebly.com/uploads/1/3/4/3/134305148/werovamur_befupana_sotanumop.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/e4d0833441944.pdf
    • https://sozivawar.weebly.com/uploads/1/3/4/5/134511290/wupinimufowigofe.pdf
    • https://xibopenevitamog.weebly.com/uploads/1/3/4/4/134488628/5973207.pdf
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/2444568.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/palikuvexake/48332004553.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/47515344942.pdf
    • https://uploads.strikinglycdn.com/files/67a0b548-4069-4f6f-8924-cdacbfabda65/marie_kondo_book_free_download.pdf
    • https://uploads.strikinglycdn.com/files/caa54ecd-b22f-47c3-924b-c2d9984ff2a5/regular_show_muscle_man_my_mom.pdf
    • https://s3.amazonaws.com/dazinibonofobi/19614144926.pdf
    • https://uploads.strikinglycdn.com/files/2ef56aa7-550a-4e6b-97a6-c3ede0c31fb4/gerumafotuxuloz.pdf
    • https://uploads.strikinglycdn.com/files/ef14fdc7-1a4b-4889-9f6e-7d40a5b6a0df/dajeleropax.pdf
    • https://s3.amazonaws.com/fasanag/pdf_to_dwg_online_convertor_free.pdf
    • https://uploads.strikinglycdn.com/files/7221faa1-de59-46c1-a45a-2f6a087b4120/giwaxewefuxutuxol.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_off0000cf79.bin
e4cb5a8232f7293c21c40afcf66bcd528038340d82ae03a413b4d45c3238ce2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 4880 bytes
font_01_sfnt_off0000e022.bin
9ae142e60f1223244f87b6a1dced5fb11a88d7e30e227c24191f011e3ab17141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 10448 bytes

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