Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8232c4edba31866…

MALICIOUS

PDF

77.1 KB Created: 2021-03-15 00:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 511bfb036ca4412c45609cc0e1d2581c SHA-1: d974e7eeef253e0cd979efc3d6bd71908f638c57 SHA-256: a8232c4edba318668d00de86137967be1647f3341845ee0164f13745891d3300
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to search terms, suggesting a lure to drive traffic to malicious or phishing websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://mezovuduw.ru/wix?keyword=rammstein+shirts+for+sale
    • https://cdn.sqhk.co/rirexiwudag/eGSjihb/pocket_bully_price_philippines.pdf
    • http://jijexuvekenim.iblogger.org/burexefa.pdf
    • https://cdn.sqhk.co/fisejadiruw/jaThhif/phoenix_airport_closest_to_grand_canyon.pdf
    • https://cdn.sqhk.co/pofifarim/ichhRTc/joom_malaysia_s_cheapest_flight_hotel_to_vegas.pdf
    • https://static.s123-cdn-static.com/uploads/4417321/normal_5fec775487647.pdf
    • https://cdn.sqhk.co/libudezetuv/ojbKgjZ/solar_2020_conference.pdf
    • https://cdn-cms.f-static.net/uploads/4453129/normal_603bea854b945.pdf
    • https://cdn.sqhk.co/sedefoken/ptgdjg2/didiviwej.pdf
    • https://cdn.sqhk.co/zumovinej/j6HibwS/learn_to_speak_fluent_english.pdf
    • https://cdn.sqhk.co/daxerarugak/gQibgjE/life_of_a_princess_story.pdf
    • https://cdn-cms.f-static.net/uploads/4392647/normal_6039b910ddd00.pdf
    • https://cdn.sqhk.co/fukefipemuw/jgjOhgc/game_dev_tycoon_switch_metacritic.pdf
    • https://cdn.sqhk.co/xuzuvazol/v4idUUN/mermaid_wood_cutout_hobby_lobby.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jopununonigemo.epizy.com/90006889463.pdf
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_d99884eb8e854635ab8744606e798c47.pdf?index=true
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_608c6b49b9dd448b93b9a1c635d1ef4a.pdf?index=true
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_09b95ba469654f509ef4fd902b405156.pdf?index=true
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_25bece19878b4b69ba7d5650a5735610.pdf?index=true
    • http://zikejozejabator.rf.gd/xojedewopesonepitemexixat.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_off0000e4e8.bin
e7be0e2fd1dba74b0b96de9bef419ecb4f1d7c1804ae1f45d1347b63fff5f643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 4800 bytes
font_01_sfnt_off0000f4ff.bin
947bc13c6d1ce34708429ab907c930c731f4d222adfd63a7893157be5d194d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10672 bytes
font_02_sfnt_off0001195b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 4324 bytes

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