Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eca187305ea23d…

MALICIOUS

PDF

83.4 KB Created: 2021-02-04 01:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f1f787313f07bf32ea18e8d6393da88 SHA-1: 9d712ee13e57acc3f97fea5fcc50d3a37957db95 SHA-256: b0eca187305ea23dfd7341150766e3693ab0bc829b97d3191a8c7157aed36bcc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malware distribution attempt, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=brake+pad+shims In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_60163992c7857.pdfIn PDF document text
    • https://ferutijuze.weebly.com/uploads/1/3/1/8/131856408/zusedabojo-nawepiwunodusa.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/difhajg/the_maze_runner_book_cover_image.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_600fc83febc41.pdfIn PDF document text
    • https://viworisexefu.weebly.com/uploads/1/3/4/8/134885507/limenebu.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/vovewuvavibowemorol.pdfIn PDF document text
    • http://svoydvalend.xyz/rugby_world_cup_2019_tv_coverage_nzra2np.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_600e0add6d0bd.pdfIn PDF document text
    • http://magic-world.site/29095816784fwetj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5ffb6d6f125cf.pdfIn PDF document text
    • https://likemopulijufo.weebly.com/uploads/1/3/0/7/130739197/92d5ba625866.pdfIn PDF document text
    • http://uablog.site/38346310835p39xo.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/z3geigb/why_is_smithsonian_channel_not_on_dish.pdfIn PDF document text
    • https://vewenaloviriwu.weebly.com/uploads/1/3/2/8/132816087/5231338.pdfIn PDF document text
    • https://cdn.sqhk.co/kilatelazobe/hdCjdAK/sadekaxiwakanir.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/ig24jfv/livezufuvufekero.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/h1hdYgj/pokemon_tcg_online_trade_forum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabezotep.epizy.com/61098775495.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_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 5280 bytes
SHA-256: d52414f9ddf4266122ba25be46a2881a0693d37eb5b0585f49fabfe0fbf23645
font_01_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 10276 bytes
SHA-256: bac18bd9ea6a53e5835c11d7d1e2f2266b0e075201e74d14d3819d82868b3ad5

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