Malicious PDF — malware analysis report

Static analysis result for SHA-256 891a1b2245038437…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 22:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 853c461122c49609dfb092377932f465 SHA-1: edc259c13b0c73ef444055bff6db450ccdc2ec06 SHA-256: 891a1b224503843721845b9cd33afffa17b0df4490787a4deb24f69c7869c32b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The embedded URL 'https://dafemum.ru/award?keyword=arquitectura+de+computadoras+morris+pdf' is likely the primary lure, directing users to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=arquitectura+de+computadoras+morris+pdf
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fc79406cee3c.pdf
    • https://cdn-cms.f-static.net/uploads/4417805/normal_600fe858b120d.pdf
    • https://cdn-cms.f-static.net/uploads/4420240/normal_5fdc5d258d082.pdf
    • https://cdn-cms.f-static.net/uploads/4472208/normal_5fd3a17b251d6.pdf
    • https://cdn-cms.f-static.net/uploads/4392661/normal_6029c6d774cf1.pdf
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fe6dbd776073.pdf
    • https://cdn-cms.f-static.net/uploads/4457302/normal_600e073898654.pdf
    • https://wovodolu.weebly.com/uploads/1/3/4/8/134861979/kadanelaxinapoxarij.pdf
    • https://cdn-cms.f-static.net/uploads/4419623/normal_603d273f45bae.pdf
    • https://static.s123-cdn-static.com/uploads/4370087/normal_5ff5dfb55e2ee.pdf
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5ff7ab34cc962.pdf
    • https://static.s123-cdn-static.com/uploads/4417526/normal_5fdd952e38cb2.pdf
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/babopu.pdf
    • https://static.s123-cdn-static.com/uploads/4389830/normal_5fffd5b80f0bb.pdf
    • https://cdn-cms.f-static.net/uploads/4461767/normal_5fda4fc3f231f.pdf
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fe24b8016719.pdf
    • https://cdn-cms.f-static.net/uploads/4382638/normal_60111d747b14b.pdf
    • https://dedaxetodopifo.weebly.com/uploads/1/3/0/9/130968947/6194755.pdf
    • https://cdn-cms.f-static.net/uploads/4446263/normal_6020fbbcabfad.pdf
    • https://cdn-cms.f-static.net/uploads/4462038/normal_603aafa30eab8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_8d62d496c1084ed6b821458cfd9d5c3a.pdf?index=true
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_8a5c2a5cd62f4460ba5525df6bcd9699.pdf?index=true
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_74e2aaefffd248aea5db5b7598934691.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_e17fe3d057434c9681acc34b65e16513.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def3.bin
8d0e6c9716e542f6fac6f4b0945ef159937d9d1360cc0d5488629f9585fd32db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 5160 bytes
font_01_sfnt_off0000f075.bin
931fa006dea1011dda862ffbc8329ec2f1bd70181dbd3dc2e2432d7857dea7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 11160 bytes
font_02_sfnt_off0001143c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 4324 bytes

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