Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f7d24d9fecc7b7…

MALICIOUS

PDF

75.2 KB Created: 2021-03-04 02:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57cd19a6de031367f0df1fb54ff534e5 SHA-1: aa574a72b96b502b921dbd897ee8f1701cdcdf8b SHA-256: 10f7d24d9fecc7b719d547f648b019b2fb95c4e847377f80b9ad62382c525fc3
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to mortgage interest rates, directing users to malicious URLs. No scripts were extracted, but the PDF structure itself facilitates redirection to external sites.

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://dafemum.ru/strik?utm_term=what+does+reduced+interest+rate+mean+for+mortgages
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/vokobagafujezit_tubegosopovaba.pdf
    • http://jixewelo.scienceontheweb.net/how_to_cook_a_whole_chicken_in_air_fryer_oven.pdf
    • https://cdn.sqhk.co/navotezive/MjdSThj/30147933851.pdf
    • https://metekubop.weebly.com/uploads/1/3/1/4/131438843/nelesozor-xokozulaxuwapu-nanaga.pdf
    • http://zunuruxeguxifi.mygamesonline.org/2010_camaro_ss_l99_0-60.pdf
    • http://fafuzum.sportsontheweb.net/child_of_god_meaning_in_hindi.pdf
    • https://cdn.sqhk.co/titesojijuko/jahhfg0/painting_with_a_twist_tampa_wesley_chapel.pdf
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/doliwas.pdf
    • https://cdn.sqhk.co/pefisemise/hA2iefG/62468642018.pdf
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/nujusedovuziniviv.pdf
    • https://kofetasug.weebly.com/uploads/1/3/0/8/130874362/e799efca41.pdf
    • https://cdn-cms.f-static.net/uploads/4447079/normal_5fda2d6f492c0.pdf
    • https://cdn.sqhk.co/dewufidabo/mWTfdjg/zofenudepego.pdf
    • https://static.s123-cdn-static.com/uploads/4493545/normal_5fdda148be89f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://saxarivoje.onlinewebshop.net/lirogerepedexedul.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/awash_national_park.pdf
    • https://s3.amazonaws.com/bezegoluzose/que_es_un_local_guide_de_google.pdf
    • https://s3.amazonaws.com/risalenefazozo/tedobusalogisuladiluba.pdf
    • https://s3.amazonaws.com/zamemigojat/asterisk_wait_for_answer_unable_to_write_frametype_2.pdf
    • https://s3.amazonaws.com/fumiposamisur/abc_tracing.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_off0000e8b0.bin
4b30f6b614b8603f222366110f94d6c4f555cc684dde781d5ce70f7ebfa101ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 5416 bytes
font_01_sfnt_off0000fb01.bin
104d185ad2766767e245cd98b9c587fcae5f36ad06da4e65874766322e4720d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 10508 bytes

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