Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a992f1b8ff09fb3…

MALICIOUS

PDF

87.0 KB Created: 2020-11-19 09:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: db43c6c682d0aeef66423c802f5900d2 SHA-1: 84b8415d69eb04dbf847fcc02b5d679ec1b3b4bd SHA-256: 3a992f1b8ff09fb3c9e6be633e51bcdf38929327d241d0ec8a700a48a3b018af
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed for SEO manipulation and potentially phishing. The primary redirector URL is associated with malicious activity. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=andhra+pradesh+history+in+english+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_5fac415daa19f.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/2c810404e6a4.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/jujunifi-dinawo.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/masobuden-wexov-tovafifinif.pdfIn PDF document text
    • https://tifajanos.weebly.com/uploads/1/3/4/8/134861866/zureri.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/4de540.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5f93702fd98d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/29ee442b-0fc7-4fc2-8c1a-1d9cbb0a06a4/javasifikule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fccc6b-ee56-42c7-a244-b9454f69924d/lemegarofuxizejog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc465be7-6063-4d11-ab9c-2269eb9c708c/dokatapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d137e1-4549-4995-9904-f5ccc57d1ba2/how_many_calories_do_pushups_burn_up.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/34257158632.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/wowimazub.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07C 5272 bytes
SHA-256: 461fe4ac44715d2e17d0c194e89b1a5f7be9fdb4ddaf4384aa4d6462e8da2571
font_01_sfnt_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 22880 bytes
SHA-256: ead4e90a8561f14d69aee173d4664b3c901c66a1447f08754d182c9d966441e7
font_02_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 10224 bytes
SHA-256: 242b83944c805f8a9a254bef58a1ff476414cb0b1d19325c196cc986d26ecbf3
font_03_sfnt_off000128d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca
font_04_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176