Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a64b8af04b9ccc8…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 10:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 867895da69c20102edffc331c2d4e62f SHA-1: 53c97e3bedcc556e1892397d8c48c20c3f88099e SHA-256: 1a64b8af04b9ccc880fffe996e59097e9c8c54b18ec94a8caa28445063f53b27
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=plant+physiology+and+development+sixth+edition+pdf PDF link annotation
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/fotekoduxugosusoxen.pdfIn PDF document text
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/gogowazipu.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/c211299f.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/47e4b8d24e1e.pdfIn PDF document text
    • http://dazarutos.22web.org/can_hp_pavilion_dv5_run_windows_10.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/todasud.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/8a54e.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/wesew-xibogase-rojopedaje.pdfIn PDF document text
    • http://suxulopiluv.22web.org/53302296613.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/busisoxulunol.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/xalexojaxipud/simple_division_worksheets_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/kesipepi.pdfIn PDF document text
    • http://jalovunenenema.epizy.com/online_application_form_of_panjab_university.pdfIn PDF document text
    • http://jubidak.epizy.com/eheim_2217_filter_pads.pdfIn PDF document text
    • http://rozipiliwune.epizy.com/how_to_record_on_dish_hopper_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/wolupabi.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/10955694886.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 5592 bytes
SHA-256: f2b47f831ef4cf95116e630d4cec5dc70fbe8086f1bbd0563ef980dec2c2ee0e
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 11232 bytes
SHA-256: b84a6d98f41afdd252a85ac8cd8e5a8322d3525262ea8ba223b0d1305db31487

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