Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2e7f14b008f0b0…

MALICIOUS

PDF

83.1 KB Created: 2021-03-29 05:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 919d29d27b8b242c96dd3bbf4a96fca6 SHA-1: 207bb7cb37cf848297aae9fe9498d2e6f8c63ee1 SHA-256: ab2e7f14b008f0b0c9e439b642cc402367949c1fc559c238fcb5f84239a99730
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, with a critical heuristic specifically flagging a mass external PDF link farm. The document body, though heavily obfuscated, contains references to URLs that are likely part of this link farm, suggesting the primary purpose is to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=can+you+use+pine+sol+to+clean+a+carburetor
    • http://waferaboteb.mypressonline.com/guerra_de_guerrillas_mao_tse_tung.pdf
    • https://kewenarizifosiz.weebly.com/uploads/1/3/6/0/136092989/1649695.pdf
    • http://zabemaladameg.medianewsonline.com/best_annotator_app.pdf
    • http://miraluvofizobe.medianewsonline.com/advanced_language_practice_michael_vince_macmillan.pdf
    • https://simejozegedofu.weebly.com/uploads/1/3/4/3/134359486/9c95c6.pdf
    • http://zumanidoxup.medianewsonline.com/kakapagojuvejubomo.pdf
    • http://fuxanujibiz.mygamesonline.org/dominos_philly_steak_pizza_calories.pdf
    • http://nateribebomulaz.medianewsonline.com/vaikom_muhammad_basheer_short_stories_in_english_free_download.pdf
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/balifas.pdf
    • http://dujojiwasemob.mywebcommunity.org/biology_for_competitive_exams_in_telugu.pdf
    • https://zemezomar.weebly.com/uploads/1/3/4/7/134711889/gudipo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_0e90ab3d16bc490abf4f1f2a0af9f88a.pdf?index=true
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_66eef846d01e4661a5a25eb558209145.pdf?index=true
    • https://s3.amazonaws.com/nojemi/adform_kiemelis_meniu.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_84a2a17e254b4f03adbb8c209bb3e357.pdf?index=true
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_cdf9f3b4be0f41dd944524a128da735a.pdf?index=true
    • http://vilatelisoto.onlinewebshop.net/best_used_trucks_under_5_000.pdf
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_e8daa6076d07423fbc6e39aeb7eb3df0.pdf?index=true
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_4e7484a997664a33ba077ad46d203bbf.pdf?index=true
    • https://s3.amazonaws.com/robumuduluwise/pesuxafijomikilop.pdf
    • http://gapoxuvopa.onlinewebshop.net/nodirujinedijijan.pdf
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_5f0d264169384dcd81689cd359b9ac25.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81b.bin
e094857f28d65303b482f91fab53957e5c49bd3cd9d64969a23369895478100e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 5072 bytes
font_01_sfnt_off0001096b.bin
e2e84d986464d523a97afaebf3c7f3fb16615709aee712302a3d29ee09b44c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10992 bytes
font_02_sfnt_off00012f28.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 4324 bytes

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