Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f2815b1ea885e1…

MALICIOUS

PDF

100.2 KB Created: 2021-04-16 17:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ece9b9f4eaadf355c9a574c4cb0648c2 SHA-1: a479901dcc153090585652f86061c62fba5ff5a9 SHA-256: 25f2815b1ea885e10f4a197c57c34318ccfe1343dce465c4e306fa76ea69c497
164 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, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a large number of external links, with one prominent link pointing to 'dafemum.ru', suggesting a phishing lure disguised as a service manual. The PDF_SEO_LINK_FARM heuristic indicates a mass of external links, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=2017+subaru+forester+factory+service+manual
    • https://cdn.sqhk.co/xuwadezab/he9dhau/jegakurulaxuzimosebupaza.pdf
    • http://sokolov.fun/geometry_dash_imagine_dragonsdw8ie.pdf
    • http://mnclassis.org/how_to_add_adobe_flash_extension_in_chromeexl3m.pdf
    • https://cdn.sqhk.co/xopuxuvop/ifgciim/escape_book_labyrinth_der_zeit.pdf
    • http://smm-target.ru/728987250404m8tf.pdf
    • https://cdn.sqhk.co/lofesaxudiwo/jdDgNge/56681885487.pdf
    • https://cdn.sqhk.co/kerikone/nyBiijg/bazaxovapipaxif.pdf
    • https://cdn.sqhk.co/nebuwaxisiw/LKggoM1/sherlock_holmes_book_series.pdf
    • https://cdn.sqhk.co/kanereneb/cjdPjak/looper_movie_watch.pdf
    • http://micrometerdigital.xyz/lattissima_plus_cleaning_instructionsfu5yp.pdf
    • https://cdn.sqhk.co/kefimuriw/ZjbgiAR/zegidunezifogelenus.pdf
    • https://cdn.sqhk.co/dolavalof/piie1q4/antaragni_raghu_dixit.pdf
    • https://cdn.sqhk.co/susojareb/igjVV61/modern_sniper_gun_mod_apk.pdf
    • https://cdn.sqhk.co/xugumewaz/PigSfBd/28886690471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_4028f64f4656408cb39d143c4d27ac1a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e61ace9e-6eee-4c65-9378-f29c943bcb87/dymo_letratag_lt_100t_manual.pdf
    • http://vorisenunajix.myartsonline.com/tissot_t_touch_expert_solar_1_vs_2.pdf
    • https://uploads.strikinglycdn.com/files/0884b9ab-8983-48bc-9949-5ad182809c5a/black_and_decker_rtx-6.pdf
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_5386f77998054be2b350fe772f66775b.pdf?index=true
    • http://fabevax.myartsonline.com/14008943394.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_5c126f06a21b4574836f0d107e4f7db8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/215bd348-5a38-4fe2-955e-8d946e6d62d7/benovewa.pdf
    • https://uploads.strikinglycdn.com/files/ab00573f-fd19-4daf-839f-ec010689d6d6/descargar_caballo_de_troya_en.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a6f.bin
11191dd47da23b0c94e17bdc3e05f8e84c31e06d2643c4da908d1bb56aaa95e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 5524 bytes
font_01_sfnt_off00014d24.bin
8c6ab2f39cba0b9da679c31e09b23e4c660e10e516b3e4de8b56f13ac6f04e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D24 11636 bytes
font_02_sfnt_off000174d8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174D8 4324 bytes

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