Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef63c9d8c00689e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 07:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 16610b5cffe68a72a36f34599fb1951d SHA-1: 69e1c5833c62bab046837c213e272886ebb85955 SHA-256: aef63c9d8c00689e5e9d5b06b5b46103d50b04e0cdb14836d5abb4952265b1fe
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=bossard+screw+catalog+pdf PDF link annotation
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/kafofibor.pdfIn PDF document text
    • http://febisulel.22web.org/kawasaki_mule_550_repair_manual.pdfIn PDF document text
    • http://gtomishebs.xyz/344727189826hg3n.pdfIn PDF document text
    • http://nevoxukuri.22web.org/how_to_know_what_kind_of_glasses_fit_your_face.pdfIn PDF document text
    • http://bluebadge-support.com/35931194783z2zv0.pdfIn PDF document text
    • http://ejinaya.com/mopewuxokosujobefi1gl4.pdfIn PDF document text
    • http://visiblawty.com/how_to_become_a_licensed_private_investigator_in_louisianarv11n.pdfIn PDF document text
    • http://varnisvakq.ru/45496989681v0led.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/pidabijigen_zugobodiziguz_laxibege_vixikejanidi.pdfIn PDF document text
    • https://mofegagopabelem.weebly.com/uploads/1/3/1/4/131438130/ruxuref.pdfIn PDF document text
    • http://operationhomeplate.com/1924935316980t27.pdfIn PDF document text
    • http://pimadukemaxi.22web.org/rainsoft_water_softener_salt.pdfIn PDF document text
    • http://businessoutsourcing.info/luwikadomavr0n7.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/rilexazejuzovep/column_chromatography_video.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/the_norton_shakespeare_3rd_edition_free.pdfIn PDF document text
    • http://wofilexiziwe.epizy.com/82117177775.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/passive_voice_structure_in_all_tenses.pdfIn PDF document text
    • http://wapinogure.epizy.com/4992427242.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/bet_888_poker.pdfIn PDF document text
    • http://vetuvawefaxuta.rf.gd/warrior_cats_wiki_characters.pdfIn PDF document text
    • http://vekejikusuvi.epizy.com/popimepavulajonipata.pdfIn PDF document text
    • http://kisirurozuwori.rf.gd/zilanepukawixoke.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 5464 bytes
SHA-256: 5888b6b935c8b95e36db98c00610f56c5823bd9debb59cb9e7f4d3238749611c
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 11564 bytes
SHA-256: 40f3cf4f0a25bdb7b751fdbaf7d23e06372658127c47ad60240f353e8efc64ad

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