Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e815c99d6f2857a…

MALICIOUS

PDF

91.2 KB Created: 2021-03-29 06:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68e54f27e19882d9261be6f2c1677b6 SHA-1: 778a9ffbc21f5ee2ba6923ec82aabc9da4310e12 SHA-256: 8e815c99d6f2857a57c254bd6d5cca96fa90b12c35609095b07660f5899fd359
126 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a link farm designed to redirect users to external websites, with one URL specifically containing a phishing-related query. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or scamming purposes. Although no scripts were extracted, the presence of numerous external links, some on disposable hosting, points to an attempt to drive traffic to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=when+to+stop+using+infant+insert+chicco+keyfit
    • http://dugipoxumiku.iblogger.org/mafadew.pdf
    • http://nozijepirag.22web.org/bopovafegegixoweduwino.pdf
    • http://wiforopevubane.22web.org/moment_timezone_24_hour_format.pdf
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/3841cfd407be.pdf
    • https://cdn.sqhk.co/xevowuto/dYljehc/hello_body_coco_reviews.pdf
    • https://xefanopebowemid.weebly.com/uploads/1/3/2/6/132681782/vusotaka_birogimododalo_dowipogus_limuti.pdf
    • https://cdn.sqhk.co/binebelezux/bifbjfq/strategy_war_games_ps4.pdf
    • https://biweworu.weebly.com/uploads/1/3/4/5/134525234/veloxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_8ecee14f433343a6a67ccac808ccb441.pdf?index=true
    • https://uploads.strikinglycdn.com/files/207ae887-d25e-42e4-a076-761c66306c73/dd_dungeon_masters_guide_5e.pdf
    • http://teperudoli.rf.gd/40418733862.pdf
    • https://uploads.strikinglycdn.com/files/2746fe0e-5faa-4d2b-82cb-f881f5d7835d/is_marley_the_dog_still_alive.pdf
    • http://dakokaxawizepu.epizy.com/blue_eyed_leucistic_ball_python_information.pdf
    • http://rejefuwozumij.rf.gd/allen_carr_stop_smoking_book_free.pdf
    • http://kosigasarem.epizy.com/55658230230.pdf
    • https://uploads.strikinglycdn.com/files/c1251250-a690-4e1e-9247-ab261fa77e0b/wiziwemidonojojabeluk.pdf
    • http://dinexun.epizy.com/puvekojuninewawabixebe.pdf
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_1ca3d4a9bbca4693a8b1a3815589e59f.pdf?index=true
    • http://wuwojagupavaruz.rf.gd/55276895370.pdf
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_60f36fad637747308565f154b8b28709.pdf?index=true
    • http://dewelimu.epizy.com/ammadi_ammadi_song.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011167.bin
97e725c3fd2ad80b46297272b09d373f0ed19ff7b7919bd077b8dbf152943123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 5424 bytes
font_01_sfnt_off000123f5.bin
539dc62d61393e653beffa019aa56e011d6435db1d456ffa632e6170f4e8a6cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 10808 bytes
font_02_sfnt_off0001491b.bin
463003a16870f03af34a7937052235faadc0ba5e128a6c9d63427814f323dcb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 16628 bytes

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