Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91dde729f17b974…

MALICIOUS

PDF

78.8 KB Created: 2021-02-13 06:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d8b3b44cd7511246c54577974fc87284 SHA-1: 14bb725772c36863cc2f85f3769165bb86535e38 SHA-256: e91dde729f17b97480b85298d6e3732932eca8f232a8c0ae34906d45affe2a44
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=fath+al-bari+english+volume+2+pdf PDF link annotation
    • https://cdn.sqhk.co/tuzevawu/XIt8jeT/4424055959.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/ejanhhH/xazorefate.pdfIn PDF document text
    • http://bigops.fun/27524819630qy9wf.pdfIn PDF document text
    • http://gozatelaji.22web.org/55156138255.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/ihojgyE/pixel_puzzle_collection_hints.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/Jt3ictY/best_craft_furniture_mountain_wi.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/yasin_sharif_tilawat.pdfIn PDF document text
    • https://cdn.sqhk.co/tawumemikuva/Oihgeh8/55691993809.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/pjapFjd/skyrush_roller_coaster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robexekipojop.rf.gd/bridgeton_public_schools_salary_guide_2017.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/wovuwajoroberi.pdfIn PDF document text
    • http://fukasutatota.rf.gd/chloroform_in_the_drinking_water.pdfIn PDF document text
    • http://segigeserife.epizy.com/zomepuratufuj.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011699.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11699 16648 bytes
SHA-256: e1be151318ffd770298d24ed49c28018e5f8c00f81ffa460474a5f3f67b95460
font_00_sfnt_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 5776 bytes
SHA-256: 79b2447fe916da14d8c45a8fe5a12f73f6e8433acb562979079e394e3d470164
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 13756 bytes
SHA-256: 924d2da44ed4e50841674b00f32e87e798efc96e5be3409207479432496240a6

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