Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9fe38bc26abe74…

MALICIOUS

PDF

74.2 KB Created: 2021-03-08 04:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e576bc31d867568c3d8fc27dc07f500a SHA-1: a8dfc81da7e51fd22a172d657ee6d211f7f2363a SHA-256: cf9fe38bc26abe7429261c05a1e7b7c5217dca9b50eb961746648f042549ddba
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure strongly suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=mario+bros+flash+3 PDF link annotation
    • http://fezelegafefuv.mywebcommunity.org/somewhere_over_the_rainbow_lyrics_karaoke_instrumental.pdfIn PDF document text
    • http://rubyshup.space/33006995535eephm.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/piwulukojuwowivek.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/cje3jdV/47378652511.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/attack_on_titan_season_4_episode_1_overview.pdfIn PDF document text
    • http://dwatches.site/xamujaselitisen5.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/are_dunkin_donuts_iced_lattes_good.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/jahdjao/64177351971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_9eb98c6647964257acddb8be2a4f86bd.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_06ebab886ac64be196f2bfda3779dc6b.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_2a4563cb5dc941179a9b1952acf3309b.pdf?index=trueIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_0bd2203eabdf43e8b384e4b14450520e.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_0c6ec35f82da4a69b11484183539be53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef8fca3-63a2-4a24-af08-7a62dd3b4940/samsung_q7f_65_2018.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_d015a8cf7f8249b6b7e67114b2d3b7a2.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_6f5e13040aff494dbde67b155bd68f9a.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_bd44b914350e494b82ce978f3a71f909.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1dd3d6-c5c6-4274-bb25-b778806a7967/what_is_tribal_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca374bf-a83e-4027-9a20-b50baa1727b6/rimafukaxefoka.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_92dcdcccd98a4bba8b8f91d0b9add8d4.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_5b350fa7e428463997ac67c7d57f528b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e609a2c-eaac-4172-9190-84566d975aea/c_interview_questions_for_10_experienced.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_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 5164 bytes
SHA-256: 58eb4ebaa9cd497726e58860aed0623db9aeaf0a4bebd57a5e9b50096c4c1eb5
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 10304 bytes
SHA-256: 0daffb2a2a6130859c801ae88c4fe5355c819941b839bb698801bba1daf37c9f