Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f1230873860b62…

MALICIOUS

PDF

77.5 KB Created: 2021-03-10 00:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8475d78e89f5e94e12a87d1de531ebdb SHA-1: 4ea32c88a55c81b99ee704cadf4717fd915abb12 SHA-256: 82f1230873860b62e89178edb690f13fb569ae43f8541cbd32595316cfb483c7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded URLs and the document body suggest a lure for downloading software, potentially leading to malware infection. The presence of external URIs and link farm heuristics further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=animal+crossing+apk+mod+unlimited+money
    • http://alcexpress3.xyz/detigokobadolobuw9xt0.pdf
    • http://baliferifopiz.mypressonline.com/bosch_300_series_stackable_washer_and_dryer.pdf
    • http://zootime.store/lavyrle_spencer_booksj171u.pdf
    • http://uablog.website/82915665996flpmp.pdf
    • http://tendernes.ru/wavepad_audio_editor2ttpa.pdf
    • http://onenature.space/453798023rfyl3.pdf
    • http://naturaitalia.space/abdullah_novel_part_2_freeebfzm.pdf
    • http://businesshelpservice.com/13593403216mle6y.pdf
    • https://cdn.sqhk.co/bitaxukezor/qjdha9c/21862524086.pdf
    • http://ludshop.xyz/adagio_spartacus_khachaturianrsqv2.pdf
    • http://zabovawupe.mypressonline.com/why_isnt_my_hp_printer_not_printing_color.pdf
    • https://cdn.sqhk.co/wedowetaso/crscZjf/38805167854.pdf
    • http://copyrightshelpscenters.com/gesugatadepikh16t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dinisemowoge/rilosirojovizazif.pdf
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_0906fbcdb3fc40dda90675fd68094466.pdf?index=true
    • https://s3.amazonaws.com/boduxatavepe/everton_score_sheet.pdf
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_af31159169674412a9026d4aba1fbed3.pdf?index=true
    • https://s3.amazonaws.com/wixamupelinere/stop_getting_facebook_notifications_android.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_86842aab8a3e4e94b272607ed09a5ee6.pdf?index=true
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_6b3cceb3ae664bb498c31ea287215368.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f263.bin
7f5099f03a83dcb7be2bce0fc9e664d90d20006bfcf1d339b61a63007e22fc0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 5548 bytes
font_01_sfnt_off0001052e.bin
06a56d54e954cf58d3f9340a3ed668cbad68d0d60a555c7ddd8dd74fe77c3788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 10320 bytes

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