Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15120c18f9a91be…

MALICIOUS

PDF

75.8 KB Created: 2021-05-29 00:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2f0d1eab73e56f5a15508262582670d4 SHA-1: d660396f3580789d5c98f80fb7659d90ff040b48 SHA-256: f15120c18f9a91bef6f86dbfad182ef253b6d36157cfd23ab97ddaade940d1ce
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, masquerading as search results for a specific book, which is characteristic of a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked PDFs. No scripts were extracted, but the structure and URL patterns suggest a phishing or content-luring attack.

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://fokemale.ru/strik?utm_term=applied+biopharmaceutics+and+pharmacokinetics+by+leon+shargel+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fc905f07a115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_60402866695c3.pdfIn PDF document text
    • https://sizonijuza.weebly.com/uploads/1/3/4/5/134594560/jovubivexot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_602ea9c59a9fd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4365655/normal_60afee6a88f2a.pdfIn PDF document text
    • https://pivikupawo.weebly.com/uploads/1/3/4/3/134356995/56630ea5.pdfIn PDF document text
    • https://fopilifufisi.weebly.com/uploads/1/3/6/0/136055159/bipanov-ribipiwisi-xanaxej.pdfIn PDF document text
    • https://vuworuvadile.weebly.com/uploads/1/3/1/6/131637376/ca33253a1.pdfIn PDF document text
    • https://diwejixa.weebly.com/uploads/1/3/4/6/134629966/404459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5fe3a790a40b5.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/b6ea3870-fdc9-4bdd-bd9a-e569ac156562/what_is_a_descriptive_paragraph_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f74c2ae-c5e7-478b-969c-20eb9e78cde1/what_is_phosphoryl_transfer_potential.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f561456-9287-406d-b048-3dbc3884c1af/64589235486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368f6964-c117-44d8-91f4-8d412798f1af/face2face_pre-intermediate_workbook_second_edition_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1bf0fe-b370-4aeb-b9de-fa96856f446f/78057274028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4069ec75-fe89-4cb4-880d-891fd8d2291e/pelemiwoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6437957e-b6c1-4a73-b485-bf07d7a64e80/launcher_darklbp_minecraft_1.13.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5956 bytes
SHA-256: 4023373e3f435fc0a5319e128688fd7a07772794a1db8e761659bb2fec3843ad
font_01_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 11320 bytes
SHA-256: ad03c285ebb9ee4242e894b9026c6a9d7550f7eeb7566d693c1aab2f87b61f78