Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8a9e8ff723f850…

MALICIOUS

PDF

90.9 KB Created: 2021-04-20 22:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 555432dfdc87e93393e95f808844cfbc SHA-1: c60a953e16c18a1c7dfe335678a0ff34d63b87c6 SHA-256: 3b8a9e8ff723f8503601620275bd8376267f31a75368ca60dee53b4fa79c4305
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The document body, though truncated and obfuscated, suggests a lure related to a 'cookbook review'. No scripts were extracted, but the presence of external URIs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jumiwimov.ru/strik?utm_term=tasty+latest+and+greatest+cookbook+review PDF link annotation
    • http://mazafaka69pussy.online/beginner_michael_myers_theme_song_piano_notes_easyi8olz.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/71357828788.pdfIn PDF document text
    • http://cucoupon.info/44265096917qjth.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/343700.pdfIn PDF document text
    • http://mamajan.space/rorinajobatudotupanazkijk.pdfIn PDF document text
    • http://perevozka.ru/98751488080lp0ci.pdfIn PDF document text
    • http://jajokojunewi.mypressonline.com/tuwazumatediv.pdfIn PDF document text
    • http://private-channel.site/requirements_for_church_wedding_in_the_philippines_with_a_foreignerx1j68.pdfIn PDF document text
    • http://kopolebukerone.iblogger.org/47373651817.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdfIn PDF document text
    • http://volazanuva.22web.org/48791442414.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/9349715.pdfIn PDF document text
    • http://katipef.medianewsonline.com/list_of_rhyming_words_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/38198428678.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/zejuviwedeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e839a7-94e2-49c0-9a44-31b79dea5f1a/jararewaditejesalukuvutek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1c9539-c622-4c18-8b7d-19ceee20f09b/how_can_the_properties_of_rational_exponents_be_applied_to_simplify_expressions_with_radicals.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/kurojufuradefozebopa.pdfIn PDF document text
    • http://soditunasi.rf.gd/49330364851.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/xepisozofuwezapexuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5197bbad-5a8b-430a-ae6d-df2e707f7fd2/fitbit_charge_hr_xl_replacement_band.pdfIn PDF document text
    • http://tuzugewidided.rf.gd/vidmate_apk_hd_video_er_2._42.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/datasheet_capacitor_1000uf.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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 2912 bytes
SHA-256: 29101dccbdd26b917ab81d9bd75cbbd6cc1355d83463c73af800c3f6313db59d
font_01_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 5516 bytes
SHA-256: 2962abe91fb63bf2660356c47ac7202f922105a9ea0b51c3b5fd80c5ab91a61a
font_02_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 5224 bytes
SHA-256: abbbf1f032826af5ad0d917f2a0fceff82fe5287bda96feb4a22e6e1e2096854
font_03_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 11360 bytes
SHA-256: e80394f02722a471c8a595c39212e308f6ecc554a7238937bf1a5b06bed11d9b
font_04_sfnt_off0001456a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456A 17020 bytes
SHA-256: b555030de2effaae29d5ab5b365377647413a3d6f1578e8da460430abdcf4790

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