Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d77a3b637146ff5…

MALICIOUS

PDF

75.1 KB Created: 2021-01-15 05:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e153e0f1067ac64719a1b262ce36c36e SHA-1: 7b34dce213bddf35e9b01268de7cdc0e3ad37a25 SHA-256: 6d77a3b637146ff57fbe336beb03804417c960a679e99428ae885bc359a1e4ce
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall detection by security tools point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=merriam+webster+dictionary++offline PDF link annotation
    • https://japewilipo.weebly.com/uploads/1/3/4/4/134471591/d184348ecc.pdfIn PDF document text
    • https://tenemetit.weebly.com/uploads/1/3/2/6/132696414/jodobigezawujuj_fonuvizebiz.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/891ca7fae0d.pdfIn PDF document text
    • https://teliwunamadawab.weebly.com/uploads/1/3/1/3/131381891/xipuvof.pdfIn PDF document text
    • https://site-1247434.mozfiles.com/files/1247434/fediaf_nutritional_guidelines_2014.pdfIn PDF document text
    • https://pobipumobixox.weebly.com/uploads/1/3/1/0/131070364/tokerifozi-judexixumad-nupudu-robujukud.pdfIn PDF document text
    • https://site-1178670.mozfiles.com/files/1178670/minecraft_texture_pack_1__14_2.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/genukawuduji.pdfIn PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/popida_megexezu.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/maviv.pdfIn PDF document text
    • https://bimovuwun.weebly.com/uploads/1/3/4/7/134727863/3190998.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/9380594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/candy_apple_red_toyota.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/how_to_make_bordeaux_mixture.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/73724667576.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 5504 bytes
SHA-256: 6cbe49789dc7acb22e92a41dc16bf752a494c4f5291601bd01efa29ae880fc5e
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 11000 bytes
SHA-256: 354160b3a6580a2e6d4cd45a35aa261ba4b6510c48e8c52702b07d9592f01734
font_02_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 16820 bytes
SHA-256: de52e6b3b1e0dd910008dc71de16364a12facb5fa50b9ad7e86fe3535f9985fd

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