Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4ac15310c30ea4…

MALICIOUS

PDF

84.3 KB Created: 2021-04-12 23:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 757a809b8993ea158b6530b7cdd7ee88 SHA-1: 75a3c3b25f714b16fca99d9fed223b3354ea8594 SHA-256: bb4ac15310c30ea465b908e40059bbf062d5ea256e57243a53fe8e727f25d8a1
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to health and weight loss, likely intended to trick users into visiting malicious sites. The presence of external links and the ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://xezojetit.ru/strik?utm_term=how+to+eat+healthy+and+lose+weight+while+pregnant
    • https://pogusunuj.weebly.com/uploads/1/3/4/8/134874329/sesegomedi.pdf
    • https://tezigawoje.weebly.com/uploads/1/3/1/3/131379443/pepapedikor_xixefodinuwuv_mijebevefew.pdf
    • https://zinobelusetepi.weebly.com/uploads/1/3/5/3/135318062/9661707.pdf
    • http://securityofusersdevicesonline.site/gavipud3iyg.pdf
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/6034705.pdf
    • http://lelazuw.iblogger.org/statistical_learning.pdf
    • https://pigakuri.weebly.com/uploads/1/3/4/6/134684466/257563.pdf
    • http://top-salez.site/worlds_together_worlds_apart_volumey9er7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fifuto/extreme_ownership_how_u.s._navy_seals_lead_and_win_new_edition.pdf
    • https://s3.amazonaws.com/naxozelozude/salozalefubigaximeziweril.pdf
    • http://pekijokedod.rf.gd/astrology_books_free.pdf
    • http://lizaduguxo.epizy.com/75897550612.pdf
    • https://uploads.strikinglycdn.com/files/6fcd52e8-604f-43f6-bde1-ced928e7dccb/thomas_calculus_12th_edition_chapter_1_solutions.pdf
    • https://s3.amazonaws.com/nilititonawafim/antrenmanlarla_matematik_4._kitap_indir.pdf
    • https://uploads.strikinglycdn.com/files/e56b1c35-ca42-441a-aa38-f096c96db549/fibetofotufito.pdf
    • https://s3.amazonaws.com/bubisifapagefe/litikagavivivupatureta.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe46.bin
a080d37c68a4cb08068e68e2efba0bd7a07d635e57b292cc1e07d8cb7bb29b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 5164 bytes
font_01_sfnt_off00010fd8.bin
46638eb607005d09623f3d355fbeaac3a3c1af033c75005cf1dea1b8f20d914b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 11452 bytes
font_02_sfnt_off000135f4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 4324 bytes

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