Malicious PDF — malware analysis report

Static analysis result for SHA-256 88595d7a2d813b9f…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 09:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f4707a7097d351c30e414db2de5f59d5 SHA-1: 1b587a760880cfb9ef48ffbb1e0d9d46a462cf68 SHA-256: 88595d7a2d813b9f865c198f02391b8ad06a34a49696a4706667fc7ef565fab7
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

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://lozipotod.ru/123?utm_term=allotment+planner+template PDF link annotation
    • https://cdn.sqhk.co/sifajoxojif/jh9Piho/toon_blast_hack_ios_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/jsKhage/30457517672.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/e16032d12.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/levimapar_nelujowipuj_desuji.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/hjjaigd/jodekifisaxezovaninegifo.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/8400d434-1dbe-4f9a-8e0b-2357df0cbef0/fezas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709c2736-6143-4e07-a4a3-8dc0e7952dd8/why_does_my_ge_washer_not_spin.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/acer_e15_wireless_driver.pdfIn PDF document text
    • http://gigevowujuro.rf.gd/werofa.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/zidodosirupokivekem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abd93dd-18e1-4503-b803-1c9b12e12ec1/56044374169.pdfIn PDF document text
    • http://zapavuvezozetet.epizy.com/anti_bribery_and_corruption_policy_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/sojitewigulad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267e6adc-0609-416b-9533-dd57d74437ab/67346182774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cd85da-e12b-4c8f-bbdc-f15edc56837c/how_to_prepare_for_foster_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a920a3-e063-4b37-8ca1-cfcca22e8f45/68801171559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b62e3a5-4808-441a-9f67-73cb46effa1b/are_stoeger_coach_guns_any_good.pdfIn PDF document text
    • http://bedipate.epizy.com/weight_lifting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e5828f-9437-4c59-8540-4bfcd5ac9f7e/50860577110.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 4776 bytes
SHA-256: ed99d8218d965dbdd1aae28d15f9536f919454c4ae893ffd785bd5540f777e16
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10596 bytes
SHA-256: c4d8fb35f63e1ee67c3b3d7ec01740e764e144a7a197b5c972b3b29e5712f88b