Malicious PDF — malware analysis report

Static analysis result for SHA-256 379f8934c6977e57…

MALICIOUS

PDF

84.1 KB Created: 2021-03-25 08:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532c87823559bee1544673eb2f0e6233 SHA-1: cbc8e1980939e37e822f2c0f4d02d00287ab9876 SHA-256: 379f8934c6977e57bc8ef4bdf0474d1f3468b67cbbca6ae27674e6b60a428b86
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, and contains a large number of embedded external links. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or phishing attempt. The primary URL, https://maypoin.ru/wix?keyword=a+raisin+in+the+sun+questions+act+2+scene+3, appears to be a lure for SEO poisoning or phishing. No scripts were extracted, but the presence of numerous links points to an attempt to redirect users to malicious 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-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://maypoin.ru/wix?keyword=a+raisin+in+the+sun+questions+act+2+scene+3
    • http://galerelus.22web.org/xizeduwezapugujul.pdf
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/81603.pdf
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/1300060.pdf
    • https://gavititexufo.weebly.com/uploads/1/3/3/9/133997787/bogegojuxadogibudewa.pdf
    • https://wuluvaxezipow.weebly.com/uploads/1/3/5/3/135393263/widunobobegix.pdf
    • http://koxitasuwoxa.iblogger.org/aashto_t274.pdf
    • http://zoguponuwuxoli.medianewsonline.com/what_is_the_difference_between_oral_b_500_and_1000.pdf
    • http://jaralet.getenjoyment.net/difference_between_1_phase_and_3_phase_induction_motor.pdf
    • http://sdfsdfsdf.shaketorch.com/40799165118.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/jefapizotov.pdf
    • http://wewofif.scienceontheweb.net/68310180941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://migisunutejelu.rf.gd/vox_oil_prices.pdf
    • http://refusunono.onlinewebshop.net/nurse_manager_behavioral_interview_questions_and_answers.pdf
    • http://tabifag.rf.gd/26678745526.pdf
    • http://zaxisomal.epizy.com/84714168640.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_ab641ab4b334469ead4f0cb65db0c03f.pdf?index=true
    • http://vigopul.epizy.com/pepekamusatevozorevoxejif.pdf
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_a582bed161ac4da19c708e1cc11b5090.pdf?index=true
    • http://tuxefunuzire.atwebpages.com/wolizuwesotatizepegajeba.pdf
    • http://lidiremuvuzanas.rf.gd/small_scale_business_plan_in_nigeria.pdf
    • http://kolawevifo.epizy.com/les_grands_principes_de_l_amnagement_du_territoire.pdf
    • http://pelewonaxiguso.epizy.com/ortografia_y_gramatica_online_espaol.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_off0000fdc1.bin
9121b5569a41ae88afa10ef4e8f9c48c552645e594b1475ab7521589500c149a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 5148 bytes
font_01_sfnt_off00010f3a.bin
f726eb90ec5ccd96250c609ac7ae4b31f8300b22f4274e8fa3fff93dd64025b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 11004 bytes
font_02_sfnt_off00013461.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 4324 bytes