Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ef55ba9181c2c2…

MALICIOUS

PDF

117.9 KB Created: 2021-05-16 23:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 25a4991e3cd24335bf73b51d716622a1 SHA-1: 69dbf0336f80672dbdaf37db83282ab43a4f3779 SHA-256: 19ef55ba9181c2c2c2219bc93a7125760da5dda667898392d5ace4f0c96648fd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a tactic of disguising malicious links within seemingly innocuous content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=sel+351s+manual+espa%25C3%25B1ol PDF link annotation
    • http://citimart.online/26188974091trcd8.pdfIn PDF document text
    • http://pubguckazan.com/soccer_football_prediction_bet3pe2i.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/gcT5Lif/bubble_shooter_candy_dash.pdfIn PDF document text
    • http://cashbackk.site/cute_cartoon_panda_plush46ue4.pdfIn PDF document text
    • http://nicepics.xyz/25095787143hb76v.pdfIn PDF document text
    • http://zimefob.22web.org/aditya_hrudayam_in_tamil_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/AhjEDaq/beripusumop.pdfIn PDF document text
    • https://cdn.sqhk.co/delinilipo/yghgcx4/kojutorogipizo.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/ohbtgin/xidumuxaxofumu.pdfIn PDF document text
    • http://prostotit.site/56057851414p46d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_76459e1adb0e45168e4883b0e1f1155b.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_7e3f4862bd2b4927a871c43bfbcb18e9.pdf?index=trueIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_c703ab49d67345e59d80ab85ec8b9518.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_6037168950c5430099ce8d45d14f8813.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/letter_v_worksheets_free_printables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ead2166-50da-4549-b321-decaa9a08af8/how_to_draw_easy_stuff_but_cool.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/bsplayer_apk_full.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/33404829063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f0b4c8-f4a8-4bba-9fb2-786b89ccc4ea/thermodynamics_an_engineering_approach_5th_edition_solution_manual_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/rikajeja.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_2ddf21a51f3c48188dc6d55f2e5b1678.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e31080-bdef-4fd4-b6eb-b96db8e03dff/42003816857.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/lopamisiwopiw.pdfIn PDF document text
    • http://liwununigu.epizy.com/98233313752.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_off00018b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B33 5524 bytes
SHA-256: 54634df7d8654b86e9f1f223e2cce68d93be96728fb1728aad1342284ff72753
font_01_sfnt_off00019dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DAD 14012 bytes
SHA-256: 6bce2dc703f62edced17d37576818fc19f11a8e90cacce95e527ef5a7429fbc8