Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d187e7b53ef786…

MALICIOUS

PDF

82.8 KB Created: 2021-05-25 15:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e6269b87a5587ccd6a7c0341e2cc557 SHA-1: e30ac59f9193ee92885e8bf3ec67daae4ec66f63 SHA-256: f6d187e7b53ef786e001f2979500b2a39a30b16f1a2e40b5a2de1b961cf08229
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with a primary malicious URL pointing to 'ponafet.ru'. This suggests a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+to+start+oral+contraceptive+pills
    • https://cdn-cms.f-static.net/uploads/4454694/normal_603cff27017f5.pdf
    • https://lopifonexebifi.weebly.com/uploads/1/3/5/9/135986218/mogubafi-livolitik.pdf
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ff1ae746513e.pdf
    • https://zakupiza.weebly.com/uploads/1/3/5/9/135960967/ganovumej.pdf
    • https://kamowosig.weebly.com/uploads/1/3/1/0/131069991/nagepeveni.pdf
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5fd6d6a6f2f04.pdf
    • https://cdn-cms.f-static.net/uploads/4466661/normal_606e707803cc2.pdf
    • https://cdn-cms.f-static.net/uploads/4476938/normal_601b65ad15318.pdf
    • https://static.s123-cdn-static.com/uploads/4473062/normal_6009852be587b.pdf
    • https://cdn-cms.f-static.net/uploads/4445555/normal_601794de85238.pdf
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fd0d840d574a.pdf
    • https://cdn-cms.f-static.net/uploads/4414682/normal_60288e319bcbd.pdf
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/4fc199cfb51fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a27234fe-fc49-4ed9-a8ab-eabeccdf8e1a/3775463894.pdf
    • https://s3.amazonaws.com/polexebuj/zonosusitewebajojadegi.pdf
    • https://uploads.strikinglycdn.com/files/5010cf24-7f47-4086-bcfc-9b9c638ad801/how_to_pair_skullcandy_earbuds_sesh.pdf
    • https://s3.amazonaws.com/luropi/4756478761.pdf
    • https://uploads.strikinglycdn.com/files/d8f65687-700e-4667-bc08-d5de1487269d/lapavanetogaj.pdf
    • https://uploads.strikinglycdn.com/files/d19f0fd7-253e-4a21-9f25-20d2dc3d9409/59124826096.pdf
    • https://uploads.strikinglycdn.com/files/a5a40cc3-4e5f-4b0c-9d87-45b5be43af1c/your_grace_is_enough_chris_tomlin.pdf
    • https://uploads.strikinglycdn.com/files/235e1d33-435e-4fa7-8751-3452c356a035/62809935719.pdf
    • https://s3.amazonaws.com/fofeguj/4_pics_1_word_answers_5_letters_level_67.pdf
    • https://uploads.strikinglycdn.com/files/41c13f3d-6e4e-41d8-b86d-e84c39352cb6/88257772316.pdf
    • https://uploads.strikinglycdn.com/files/5e7f87b8-2c91-4fac-9b86-7f4382b1c115/self_esteem_building_activities.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106f6.bin
db92f381a718cc1425276d8b7a70b1afc7e19b90329c085b6840e393cb85c6fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 5040 bytes
font_01_sfnt_off00011841.bin
37dd90e6f69511bd56f9feddaeecdcf9a4632c400165d43d0d7db5e7cfdb111c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 10884 bytes