Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a5a1b5dc7afcfd…

MALICIOUS

PDF

122.9 KB Created: 2021-04-29 01:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7b55c6db1bddb96f2aebf9470198718e SHA-1: dbe388f9f80ea117190c51b0c299bd8c86bf9071 SHA-256: 53a5a1b5dc7afcfd105333c5882f52809fdbe9248e9c9476981918f3c38ec331
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://soxebez.ru/strik?utm_term=star+trek+discovery+forget+me+not+cast+imdb PDF link annotation
    • https://benezome.weebly.com/uploads/1/3/5/4/135400217/nevoximit-fugipek-balotarinam.pdfIn PDF document text
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/8404639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_600b7d205d9a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_60099effb382b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_6035caf769c46.pdfIn PDF document text
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/cdc97.pdfIn PDF document text
    • https://bokobuduvi.weebly.com/uploads/1/3/5/3/135347682/99306cc3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_a9661e3c4bdb4c5b9176345502c97026.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/bejezirofidoxop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cc9534-2abb-4611-9ede-94b18cb1ed03/peter_f_drucker_net_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/great_depression_causes_and_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3c45b9-e334-451d-9c47-0a8ee810ae72/what_is_the_lowest_animal_on_the_food_chain.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_bf223adfe4174712a934c67d8b44839e.pdf?index=trueIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_ebb4fe538746414198bf7b7c12826106.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vasofirida/timuvuvinipegik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68d8077-488d-4753-9a52-7468735c4234/how_to_create_your_own_gym_at_home.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_67e1dca506464363b7bb8b7754b5bf31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75057f43-3c52-420b-9494-a60c254f1734/vuzosine.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_a52add10154c49d5a7c3d6dc2cf26d41.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_459eb161f3ab48ebad17c6593c7c9573.pdf?index=trueIn 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_off0001a1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1E3 5780 bytes
SHA-256: 5d0cc82e42ee72e0f43509974d4b87eeb47f0567774dbdff23758216d62bb42d
font_01_sfnt_off0001b58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B58E 11880 bytes
SHA-256: 524a1a434905556669d1be56ac562ff02599ec71510c126f0b7ef113f170fb1e