Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d6b5882e580856…

MALICIOUS

PDF

75.4 KB Created: 2021-02-17 15:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f648bdbd4b8ad79861114ae139c25129 SHA-1: 17d6de448ebd1ebfde07a38738fb93baadbedd21 SHA-256: 73d6b5882e58085668d4e6ee163e281945f82fefc3f37dde739e9e95103611c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains multiple embedded URLs, including one that appears to be a redirector with UTM parameters, suggesting an attempt to direct users to a malicious site. The document body, though heavily obfuscated, contains text that could be interpreted as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=cbt+treatment+plan+sample PDF link annotation
    • http://tojasojula.iblogger.org/cool_movies_com_bollywood.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411714/normal_5fd05f2cc70ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_602cf348a9954.pdfIn PDF document text
    • https://jokesekarizav.weebly.com/uploads/1/3/1/4/131407558/ralexilupupov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_602c514b566f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470542/normal_5fd8b70f8324e.pdfIn PDF document text
    • https://xitarowax.weebly.com/uploads/1/3/2/6/132681505/mavezitifom-repife-nidiga.pdfIn PDF document text
    • https://femowoziso.weebly.com/uploads/1/3/1/3/131398515/0859184393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://loratozojakin.epizy.com/wawelomuwewugezujadam.pdfIn PDF document text
    • http://dikewovob.epizy.com/bachna_ae_haseeno_movie_song_wapking.pdfIn PDF document text
    • http://zorogeloma.epizy.com/bones_series_2_episode_guide.pdfIn PDF document text
    • http://zarevarepi.epizy.com/3395687311.pdfIn PDF document text
    • http://tiwadelir.rf.gd/character_animation_crash_course.pdfIn PDF document text
    • http://bodazovire.epizy.com/40313543932.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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 4756 bytes
SHA-256: 5198d9ff0d6250e54e2fe7a0695484c90b0ad3e8e0e3b414d2463e58bf087e18
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 10212 bytes
SHA-256: e6450a520b33f4565dccda2a910ccc5170f9bd66ca47b0859dd7a8abda3818af
font_02_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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