Malicious PDF — malware analysis report

Static analysis result for SHA-256 5123a0e7ac5dc21f…

MALICIOUS

PDF

109.4 KB Created: 2021-03-19 21:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f26f12e39ae731d9fc1deb2aefcca362 SHA-1: 0d1691d1dc0ed3480018343d75fba65b34b1d60a SHA-256: 5123a0e7ac5dc21f33ee7d11d49bc4fa1908a8e3bcc42d744335f710e9868bdf
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://nipisod.ru/123?utm_term=android+studio+run+emulator+command+line PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5fd834a717056.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/igg0wib/1973817595.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/what_is_the_timeline_of_the_world.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/16335246546.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/9x5pge7/learn_to_play_acoustic_guitar_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/mrMdUjj/hypercolor_fluid_simulation_live_wallpaper_iphone_x.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ryAzieA/kobunenegamenu.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/73472577386.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/what_is_green_slang_for.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Laihzge/togigulodidukezizev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_603416c7c2bb2.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/geXhjjh/final_fantasy_legend_ii_maps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_6052b71325ed8.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/FDgdOEK/gepasafunemupuvubupuroku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5fd649038ebad.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/zegufuteponutajon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sanojepenot.onlinewebshop.net/english_synonym_antonym_dictionary_download.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/77340350211.pdfIn PDF document text
    • http://vowojuxibaxo.myartsonline.com/rezodokaradifusivoje.pdfIn PDF document text
    • http://fepobidim.rf.gd/free_download_piano_sheet_music_fur_elise.pdfIn PDF document text
    • http://rawozenagi.epizy.com/black_and_decker_weed_trimmer_replacement_head.pdfIn PDF document text
    • http://gokegufokefewev.rf.gd/sijerimafa.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/how_to_start_vedic_maths_classes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBE 4956 bytes
SHA-256: 2f870a0c3c61bd847fa668575fde94ff039615b17e3993731410d222a7f9de51
font_01_sfnt_off00016d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D73 12772 bytes
SHA-256: 7ac2604b1d58ff3dadc99abd96d98669527ad4d0fd53a92043146abc2e899a2d
font_02_sfnt_off000198fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198FA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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