Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1280fce676d5b1…

MALICIOUS

PDF

79.4 KB Created: 2021-03-21 01:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2efb39cf95274f9f57589623d6fc5ee SHA-1: 78357715f5a0ce1fe066cb868b2be7fc2ffde253 SHA-256: cd1280fce676d5b1dcf30f41e3c548700b253b0aff6151c135b65057521dc21b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or SEO spamming campaign. The ClamAV detection and ML classifier also strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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
  • 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/award?keyword=anatomia+microscopica+morroni+pdf
    • https://cdn.sqhk.co/bapisolel/hdyibii/battle_sound_effects_ww2.pdf
    • https://cdn.sqhk.co/vilomikov/fTJYhi4/16704368389.pdf
    • https://cdn.sqhk.co/xewafazuk/ifjhcOx/37719347157.pdf
    • https://cdn.sqhk.co/kekelivig/jdihEKV/cake_recipes_from_scratch_for_beginners.pdf
    • https://cdn.sqhk.co/kasunelebak/XdUigjb/cultist_tft_spatula_item.pdf
    • https://cdn.sqhk.co/gizukakom/lmgcheE/63015181824.pdf
    • http://tesar-krd.ru/como_tirar_a_oleosidade_da_peleh9q7i.pdf
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/naxiseju.pdf
    • http://tekplafond.xyz/tujavoxugufikonekoduruvit5r.pdf
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/56b223.pdf
    • http://ductsunlimitedins.com/mizesu30dir.pdf
    • https://cdn.sqhk.co/madosodu/mZCjigh/cape_cod_fishing_report_march_2019.pdf
    • https://cdn.sqhk.co/jinubodilev/ficaAhg/sozutidi.pdf
    • http://fito4ka.xyz/masarouohzo.pdf
    • http://liketime.online/los_dones_de_la_imperfeccionoiio4.pdf
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/075bbc3a7298b.pdf
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/9860060.pdf
    • https://deduxujixonegox.weebly.com/uploads/1/3/4/7/134731806/wiruwumifek_xozufi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_3b7d11be7dd64843bd402be653aa6187.pdf?index=true
    • https://s3.amazonaws.com/bevekizadoxuj/45519569111.pdf
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_82c0b0bb4cab4d24bbe5019264a9e7d7.pdf?index=true
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_01a7dad2a10c46b9bb8b1ddb3102790a.pdf?index=true
    • https://s3.amazonaws.com/bogijexu/temperate_woodland_and_shrubland_abiotic_factors.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77f.bin
fcca1b0abdd29b5fe515e23f9654905f7e55f94437428f31666ca74b168e8a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 5260 bytes
font_01_sfnt_off0001094c.bin
c290ec3a6df7b605b4f9e61f5e20199349e5692a45764c4b92e7fe0c21692d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 11876 bytes

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