Malicious PDF — malware analysis report

Static analysis result for SHA-256 3589064e9b5159d8…

MALICIOUS

PDF

71.8 KB Created: 2021-06-05 09:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2be9d988f4753fd137254e98cc3dc879 SHA-1: 28d8a24050c24df8d71bb87362f291f597eece90 SHA-256: 3589064e9b5159d8e2243e7dcb7f01c2051944b244e06f57b7cd691169bc0e64
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with a primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://coretry.ru/pbw?utm_term=how+many+diary+of+a+wimpy+kid+wrecking+ball PDF link annotation
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/losogebinux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479213/normal_600d27666d4e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_603f4b83db2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_603d0a0e72db1.pdfIn PDF document text
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/3225129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367912/normal_5fe5c2962bcf7.pdfIn PDF document text
    • https://pudixibavumop.weebly.com/uploads/1/3/5/9/135964902/powogebekut-maraledam.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/e497e48c-e1ef-4ca6-acb6-68fb8f9bd119/pazukekatekorakebute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ce0060-0456-48d1-b8fd-dc472853c78c/17608602415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f625b00-a921-43ce-9202-8ccda00e5ac5/how_do_i_find_my_router_admin_username_and_password.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/f/race_to_witch_mountain_full_movie_in_hindi_hd_download.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144645759/psychoanalytic_theory_of_personality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a45887-776d-449a-a7bc-5963bcc19d98/points_of_concurrency_in_triangles_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfce07a-535a-4098-8a33-c38bb3afd084/sabizudemidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7380fd64-47d5-4d02-a81e-45bc9f3fe238/petulonirajupadup.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144427707/zanitulipunusapepux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16c2889-0765-41c2-9291-402716be7626/how_to_fold_total_gym_platinum_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249e070d-3ce3-4627-974f-5fa51bb84777/12056516736.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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 5656 bytes
SHA-256: 7207d16ffada319c76090c7dac04a03b8311c0e59a40718ba777ab194962bc29
font_01_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 11092 bytes
SHA-256: c4d5096e4fa42b6b1db3d4b7d2170a46da2a3223b3c76a654f6048e5eac5da5b