Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92ae38301735792…

MALICIOUS

PDF

105.3 KB Created: 2021-05-17 23:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4b7212ac49d533560f34bcdeb3c30fb1 SHA-1: 8035215e9748859b05480ad58d65866b6a4da851 SHA-256: e92ae38301735792f25b008f689c6e7da4c53e92ce69a6cb151e5d7edc73c6f7
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key', which is a common lure. The primary malicious URL identified is fokemale.ru, which is likely used to host a secondary payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://fokemale.ru/strik?utm_term=gateway+b2+student%2527s+book+answer+key+unit+1 PDF link annotation
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/e5788a86c180a3f.pdfIn PDF document text
    • https://mifadugusukar.weebly.com/uploads/1/3/5/3/135337027/lijufezunojo.pdfIn PDF document text
    • http://pifevowomekol.22web.org/first_grade_fluency_rate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380229/normal_5fcc9ab597603.pdfIn PDF document text
    • https://kakejomoweva.weebly.com/uploads/1/3/4/6/134674311/nenojibeba.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/74da9b2f3cd5cac.pdfIn PDF document text
    • https://nogurutofuxuj.weebly.com/uploads/1/3/4/5/134525281/6f0e24d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_601fe73653857.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://lufivav.epizy.com/veviriniva.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/network_marketing_syllabus.pdfIn PDF document text
    • http://zubeleboju.epizy.com/the_amory_wars_volume_1.pdfIn PDF document text
    • http://sosesejuwukoga.epizy.com/55055104526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80c5ca8-4308-4cdc-8af3-6436877fb161/2330775522.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/tekemevozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a1ae59-54af-485e-a95d-feacd9b07644/17215587319.pdfIn PDF document text
    • http://tukuzadixejune.epizy.com/husqvarna_435x_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/cafe_racer_hack_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fee3f67-e94c-4a2e-be7a-d6656e6a0e4f/faria_depth_sounder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b68af4-15af-40cf-a8e3-d321e1476ad6/pelijemapadurotodozoxojab.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/what_are_the_different_types_of_creative_nonfiction.pdfIn PDF document text
    • http://lopoxupalajimuv.rf.gd/touch_of_class_car_wash_coupons_poway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33c7276-c06e-457b-a1b4-74ef139b0cba/how_many_miles_will_a_2010_camaro_last.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 3420 bytes
SHA-256: 3d585c66d30cfa8f0dc8005b072623373e436d9b1fbec9d58b3007cb0e5d534d
font_01_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 5316 bytes
SHA-256: 034ce345b9f597e541bfe4b8ec8fe70dd2a06587682161e6517e58391ba99175
font_02_sfnt_off00013c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 16828 bytes
SHA-256: 6a69238bf03ca2e325ddcb76eda48c6dead23d3aa470791f89185daf8bf8bb1b
font_03_sfnt_off00017146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17146 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_04_sfnt_off00018674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18674 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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