Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a7fa99037efa21…

MALICIOUS

PDF

114.1 KB Created: 2021-06-03 10:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5f9f20a6d4ac4a94b5c58eb4281bab5 SHA-1: bb4e1a60f07be1d78d6d544773f215d08bd26ded SHA-256: c9a7fa99037efa21872d592e0635f3e541c26996fd1eb47f6f887f7201d5ec12
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was heavily obfuscated, limiting analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=application+lifecycle+management+hp PDF link annotation
    • https://deroguba.weebly.com/uploads/1/3/4/6/134684347/78414587ab93.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/libab.pdfIn PDF document text
    • https://tifunubuxeji.weebly.com/uploads/1/3/4/5/134523212/7540c29a.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/3d957a6fef3.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/4541334.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/pajonepuxaf-bexetev-xifikevodof-mumumave.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/tifavofat_doger.pdfIn PDF document text
    • https://gigerexug.weebly.com/uploads/1/3/5/3/135341911/8fc0fb650.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/tojomem_dosatuzufab.pdfIn PDF document text
    • https://wevikafajaxa.weebly.com/uploads/1/3/1/1/131164556/busikubiwekevowibin.pdfIn PDF document text
    • https://gulawunobuxag.weebly.com/uploads/1/3/4/6/134627092/semijetewotokoxugu.pdfIn PDF document text
    • https://midoninojun.weebly.com/uploads/1/3/4/6/134665084/fugexugimoxawib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57f87f0-4b86-4d0a-b9d0-51f3800add26/on_the_sidewalk_bleeding_post_reading_questions.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/73837877939.pdfIn PDF document text
    • http://joxupakager.pbworks.com/f/wiworaratapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e45e8f-aa51-49a1-b3c3-90d453f82ba9/commercial_bank_of_ethiopia_android_application.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144532359/62517162636.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/what_is_no_starch_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218923c9-00d6-42d3-bdbd-984c773b8249/vozuzejiruvixemusiv.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144424335/fejunorogikewujuto.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144435141/walovatekelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09a8392-8e21-40c6-9d4a-87bf0f0a9662/tafeforulowenujozaxedufet.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/norokesidavete.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_off00016bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC3 5244 bytes
SHA-256: d16408f3600884ad913756eb93f7384d2975f253ef337cc5f050a7819786493c
font_01_sfnt_off00017d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D8A 11376 bytes
SHA-256: 0ffcee370e88d842efa6b165163be78434fb1d7374129e91d3f61818032478b9
font_02_sfnt_off0001a49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A49D 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e