Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b81110823d285…

MALICIOUS

PDF

75.5 KB Created: 2021-05-05 01:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a66e67065681ce36a4b10d9cb4e074b SHA-1: b3176724af0cfef38fca76c3f51ccbccb17fb1e0 SHA-256: df9b81110823d2850bf24ad9337b759b299c365eda5caaaead1a7c98320b5cdb
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains references to product upgrade kits, which is a common lure. The presence of ClamAV and ML heuristic firings strongly indicates malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=shimano+ultegra+di2+tt%252Ftri+upgrade+kit PDF link annotation
    • https://foruvojupizife.weebly.com/uploads/1/3/4/3/134352799/pivigaxujexuv_zomusetuduzu_papaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/7sidpwo/detecteur_de_mouvement_arduino.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/GFjejhg/battery_operated_christmas_lights_with_timer_walmart.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/vugomexuruvoxof_nubevamakokaka_kobofijogivukir.pdfIn PDF document text
    • http://hook-up.fun/zuzuzhqtjt.pdfIn PDF document text
    • https://cdn.sqhk.co/fotajoge/djhZifc/ghost_racing_formula_e_apk_data.pdfIn PDF document text
    • https://ratowoxure.weebly.com/uploads/1/3/4/5/134584599/20928.pdfIn PDF document text
    • http://vitrinachel.ru/lefezexotujopasidixajagebtv9l4.pdfIn PDF document text
    • https://lotekine.weebly.com/uploads/1/3/1/3/131381428/dee12c143cf43c.pdfIn PDF document text
    • https://vixewomofuv.weebly.com/uploads/1/3/4/6/134606761/liwoxuduve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_945df2a7c541485287f5712525855e37.pdf?index=trueIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_436927017a724b7fac753360acba13a6.pdf?index=trueIn PDF document text
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_67d7a5540df1400087a7a9d7afe343fb.pdf?index=trueIn PDF document text
    • https://4fd7ac12-06e8-439c-96a9-7636004ccb32.filesusr.com/ugd/9554ab_eaea6cb27ac944e7a52f3a00f4b740a1.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_c4b79c79e7b741c1a80a3216331fe7a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/hp_500_plotter_driver_windows_7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/how_to_program_a_philips_magnavox_universal_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/naughts_and_crosses_template_for_email.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/moluzupodizututimumaji.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/tetodaj.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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5528 bytes
SHA-256: 129064cd0f07b826cd1db374e516b97a4047a9a3ab78648b3cbd1d5d7672dc95
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 10944 bytes
SHA-256: 15b73d4cba2127f05bf902102f6938c798ed104393e0429839eb63217d3cef25