Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8b044976717a8f…

MALICIOUS

PDF

74.9 KB Created: 2021-05-10 15:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b6f4d57393ccfd9ee70100816c2e243e SHA-1: b288c8966a1615218ef04cf72a40577d971dfe41 SHA-256: 1a8b044976717a8fdebaff5be7bfc56e73183833c4b2008d0b4f048b200f56ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=why+is+my+fb+news+feed+blank PDF link annotation
    • https://cdn.sqhk.co/xugumewaz/jgMjdge/38972079970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464722/normal_6001849aa9e8f.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/ifaHRje/45502024345.pdfIn PDF document text
    • http://ludshop.xyz/jatum0p2fv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_60546bb453fa8.pdfIn PDF document text
    • https://cdn.sqhk.co/xekixuzurim/chcjejc/transport_tycoon_deluxe_download_dos.pdfIn PDF document text
    • http://mijudivoxobo.iblogger.org/24636127128.pdfIn PDF document text
    • http://popibiku.22web.org/25995039116.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/hcgfVV2/lexijupetedodabipo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460677/normal_5fed278a7288b.pdfIn PDF document text
    • http://lnstagram-office.com/darkest_dungeon_pitch_black_dungeon_guideqvb6e.pdfIn PDF document text
    • http://scriptbook.xyz/fejufizozpdi6e.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/eticogh/hair_salons_open_in_northern_california.pdfIn PDF document text
    • http://greenbike.shop/jodogajijasufabomevofuw9pkks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_603170f72fd23.pdfIn PDF document text
    • http://acgmgroup.ru/command_and_conquer_4_full_gamemnmya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_6010f0a4eda7b.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/iengvMV/3390732106.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/mupukesunobaga/bugaboo_frog_britax_car_seat_adapter.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/kakuvosotive.pdfIn PDF document text
    • http://gasikogo.rf.gd/modal_auxiliary_verbs_exercises.pdfIn PDF document text
    • http://ruguweronum.rf.gd/2479432831.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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 5460 bytes
SHA-256: 311b4706973e04d2e1c1d690a3173dd38eb29aa701c8992c0dfd42b1df37a7ee
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 10552 bytes
SHA-256: 9dfdae7ec08f48458ddd6a11b85f10a0003fa7b53c7cb21a226afcf5d25fcc8d

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