Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fe664470956a31…

MALICIOUS

PDF

77.6 KB Created: 2021-06-10 06:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: df8a0029bdc9db921639702e11e001d8 SHA-1: 6310fcefc66eb2cf5a0f6ae3ba67885ec3e160c7 SHA-256: 84fe664470956a316ee0add5876ce397e75ee963d7c1e04a49d9059b894d8cd1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The document body, though partially obfuscated, contains a lure related to 'baby boy percentile chart' and references wkhtmltopdf, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crewmak.ru/pbw?utm_term=baby+boy+percentile+chart PDF link annotation
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/kozezopumodokujew.pdfIn PDF document text
    • https://fufagefi.weebly.com/uploads/1/3/4/6/134638184/xufijusizi.pdfIn PDF document text
    • https://sewetinupas.weebly.com/uploads/1/3/3/9/133997680/sepipoti.pdfIn PDF document text
    • https://xitujufos.weebly.com/uploads/1/3/1/4/131483255/d53ebb6e122.pdfIn PDF document text
    • https://zapunetiregete.weebly.com/uploads/1/3/5/9/135956705/fosudokavote.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/797d811.pdfIn PDF document text
    • https://nokajaxupi.weebly.com/uploads/1/3/4/7/134715681/f7d603146a1a87.pdfIn PDF document text
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/pasol.pdfIn PDF document text
    • https://rofukidixupa.weebly.com/uploads/1/3/1/4/131414661/tanujavoxobefax.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/badaxezuvafukuwulika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minuwaxiper.pbworks.com/f/mumigisemaxe.pdfIn PDF document text
    • http://zulamiz.pbworks.com/f/mdmp_mission_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371f17e2-9fa5-4ca3-b8b2-4f144a498915/corel_draw_x7_free_download_full_version_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad76c5b-fdbe-4e3c-975d-04ef10dca531/honda_2000i_carburetor_adjustment.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/jusunoni.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144426072/hadoop_the_definitive_guide_github.pdfIn PDF document text
    • http://degomulaxib.pbworks.com/f/shirdi_sai_jeevitha_charitra_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80560cf-6152-4264-a61d-a7b703c11525/76199847853.pdfIn PDF document text
    • http://gutupum.pbworks.com/w/file/fetch/144665172/fedilaba.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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 5136 bytes
SHA-256: a66376012be16fa71a1852d25dbc7314b76f8f45a0b428c03ca3de5ce6ae807a
font_01_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 10804 bytes
SHA-256: 85e7ced96e5a1c5be772bb2dc5f4079895b0f7f0fba60f8aa455466c7b66beb7

Open this report in the interactive analyzer, or submit your own file for analysis.