Malicious PDF — malware analysis report

Static analysis result for SHA-256 687571b177fdedaf…

MALICIOUS

PDF

78.6 KB Created: 2021-03-25 12:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b8bd39947d6c176bf41811c4763b271 SHA-1: 130c846f9b2cbe8ac4b8b948a58a4722083f7fda SHA-256: 687571b177fdedafb41459d240fe00019c0f3c4c4845e44f5b11f4703ac461c3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that appears to be part of a lure, referencing 'asvab practice test download pdf' to entice users. The document body, though heavily obfuscated, contains similar text, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=asvab+practice+test+download+pdf
    • http://sowopezamiw.medianewsonline.com/pipiso.pdf
    • http://kuwawaf.mypressonline.com/contract_agreement_between_two_companies.pdf
    • https://cdn.sqhk.co/mizopopowaze/gjgibii/vibuxafagipexejapuki.pdf
    • https://cdn.sqhk.co/romilononove/CFUghzE/roguterujonokupoxuwelegi.pdf
    • https://cdn-cms.f-static.net/uploads/4445550/normal_60556fba4988a.pdf
    • http://serururepus.scienceontheweb.net/buvisodajidudo.pdf
    • http://xosubowavenu.mypressonline.com/psychologie_de_la_vie_amoureuse.pdf
    • https://cdn-cms.f-static.net/uploads/4444114/normal_6037f5cc8515e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dutuzanob/26659174398.pdf
    • https://s3.amazonaws.com/zuwosil/how_to_synchronize_hands_of_original_tissot_t_touch.pdf
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_545442dca4e54397a4f3abf43976aef1.pdf?index=true
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_4cbb7483c86546c496ce297e6a9fce41.pdf?index=true
    • https://s3.amazonaws.com/saziwijaxodav/chinese_pinyin_to_english.pdf
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_51429b6e293f4abdb5dbc6250369e26e.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_dbe62a65defb4162bdce91205228fa50.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ffd5c011-9da2-4faf-a002-a6050fbaf6cd/how_to_turn_off_airplane_mode_on_doro_flip_phone_7050.pdf
    • https://uploads.strikinglycdn.com/files/f844b252-ec4a-42b0-98ff-0907dd78dbc6/sedadipi.pdf
    • http://molujafit.atwebpages.com/functional_programming_in_go.pdf
    • https://s3.amazonaws.com/pezofut/2006_vw_tdi_oil_change_interval.pdf
    • https://uploads.strikinglycdn.com/files/2e249175-be41-42c3-8c58-1277f2652731/zugagozobetuzufuxoninufup.pdf
    • https://uploads.strikinglycdn.com/files/ef32e9b1-6028-4270-a393-2e2b1b7e7ed9/gezizuvexisis.pdf
    • https://s3.amazonaws.com/vuliwisuwig/gosizux.pdf
    • https://uploads.strikinglycdn.com/files/1bbf3dc6-7cd4-4501-9601-0992ebcd8d65/best_large_short_haired_family_dogs.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_off0000e891.bin
f05e5b424a90557823bc5d18e1002977f328dfebc5bac4182cc4489f17f3bd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 5428 bytes
font_01_sfnt_off0000fb21.bin
4ebbaa3934d540f4723f57a6caaa96d6691247292a80e9a3c401c8f39f3b9127		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 1792 bytes
font_02_sfnt_off000103dc.bin
9c37ff87cc0a23f1e9d51e2fce6ce82c42b93301e269269c23098e11c4ab2b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 12120 bytes

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