Malicious PDF — malware analysis report

Static analysis result for SHA-256 761b3dfb3278e293…

MALICIOUS

PDF

62.3 KB Created: 2020-11-24 10:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5a43f7d2ba425cab9f7ef78480e459e1 SHA-1: b8fffe02bded9c12577c61b7c8edf794a2cb26f0 SHA-256: 761b3dfb3278e293fc685ece6eddbc1a88590d10c5b826cc5f716510cfcd328e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://traffking.ru/strik?utm_term=aqua+mail+review', suggests a lure related to 'Aqua mail review'. The presence of multiple external links, including a link farm, indicates an attempt to redirect the user to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan distribution vector.

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 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.
  • 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://traffking.ru/strik?utm_term=aqua+mail+review PDF link annotation
    • https://vumusubivabup.weebly.com/uploads/1/3/4/4/134491869/4457294.pdfIn PDF document text
    • https://kifelulamexeb.weebly.com/uploads/1/3/4/3/134310841/6018832.pdfIn PDF document text
    • https://dupevikalibo.weebly.com/uploads/1/3/4/6/134659617/331398.pdfIn PDF document text
    • https://bevalapiwilidi.weebly.com/uploads/1/3/4/5/134587476/rixemopomuvako-japebegefiv-sarukotadokax.pdfIn PDF document text
    • https://tuluseso.weebly.com/uploads/1/3/4/7/134718642/peparuvejo_remuja_pozekog.pdfIn PDF document text
    • https://xuguzopagar.weebly.com/uploads/1/3/4/4/134490213/gogijitubozuf-mijugilo-zaluvigamisov-wozuwozaro.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/jijumupade/kundli_software_free_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/48802900991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7121ea92-1a58-476e-8d85-46ae4a100930/pibuwodubameforuxuxepit.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/3ds_emulator_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/d_d_5e_character_build_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/simple_past_tense_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/kizevavur.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_off0000b95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95E 4920 bytes
SHA-256: 063bc2c4e935f1891c525b28b7907a2ed5eaffd1952db95e14b20c18c2d25e17
font_01_sfnt_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 10144 bytes
SHA-256: 57397aa00dba6b084e8faaa60198b9f4d0849e3b5a5b7f53a881de7426ba7e63

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