Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a5d73ffa0cf61a…

MALICIOUS

PDF

80.3 KB Created: 2021-02-21 01:27:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e76c15bc9cd2ea95bba44ef3a700081f SHA-1: 12952e1664f4ffafb38ad25f0e636c813999bb55 SHA-256: 04a5d73ffa0cf61a336c27a219283b37d20603b866d400496ac5e4cc91e90cbd
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=kindle+touch+will+not+turn+on PDF link annotation
    • https://cdn.sqhk.co/musutalivun/jiRbqgh/fufebupemavijudika.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/Njg8Ngj/46576914998.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/b693f20982b.pdfIn PDF document text
    • https://kenigoxiwe.weebly.com/uploads/1/3/0/9/130970014/mawubexej.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/jbFkTSt/the_blade_runner_2049_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/jalUigX/65606623814.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/geWuHjb/golobifevi.pdfIn PDF document text
    • https://fiviwadixuxenel.weebly.com/uploads/1/3/4/8/134854304/zifetigafogaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/naxenunovus/q9eieza/smart_charge_intelligent_battery_charger.pdfIn PDF document text
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/givigejoki.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/DFSmtia/smash_rush_17.pdfIn PDF document text
    • https://tapukinag.weebly.com/uploads/1/3/1/6/131606864/3076518.pdfIn PDF document text
    • https://cdn.sqhk.co/jixavome/gc1hhja/resimezaxipaliduj.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/ZhgWf12/you_hit_them_all_correct.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/bifEibM/tagexuv.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/eTPhaih/crossword_puzzle_free_printable.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/sesafefanulokam/14215300088.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/71279709835.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 3176 bytes
SHA-256: b03aea3a589eeaddcd5f994f19adbb2a1dc58bfef62994d3bba9a8cdf25731a8
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 4700 bytes
SHA-256: 63ccf8a1bcd1a687a0ebdeb3c5f0ebe16b2023c8a43ccd2f3644936c11a5c67c
font_02_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 10664 bytes
SHA-256: b9c9dacba41445e42a70eecf20f8dd4b634db33ed7e0f84f6ba68f0a581ebf0f

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