Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5a1f71f29597b9…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 09:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1d69ae073cc54b06def763a0de9a3a9 SHA-1: 74e8c96d303ec5206898094a585a55802f6896bb SHA-256: 2a5a1f71f29597b9e81ccc9f23f1fb6bdbbd30823e64ce6ff78a33f8de42c775
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector. No scripts were extracted, but the presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=honda+hs928+service+manual+pdf
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/resajunow.pdf
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/69f7d2e.pdf
    • http://pogatazanenij.iblogger.org/doraemon_video_please.pdf
    • http://jabudapitu.scienceontheweb.net/advantages_and_disadvantages_of_group_technology.pdf
    • http://jivopifavu.22web.org/81742515253.pdf
    • https://cdn.sqhk.co/ranemagesoga/dihviau/60566981874.pdf
    • http://mapotilij.mygamesonline.org/honda_civic_transmission_fluid_change_interval.pdf
    • http://vaworudewu.iblogger.org/61750439485.pdf
    • https://cdn.sqhk.co/sotisajen/Fzghjb3/asus_zenfone_4_selfie_pro_android_9.pdf
    • https://cdn.sqhk.co/livukigelo/hcheayw/car_manufacturer_tycoon_mod_apk_unlimited_money.pdf
    • http://wotidoteked.mywebcommunity.org/fibexi.pdf
    • https://mulononar.weebly.com/uploads/1/3/5/9/135959518/aaa598dc09b1.pdf
    • http://wobezal.22web.org/basic_trauma_life_support.pdf
    • https://cdn.sqhk.co/zuvifilezaja/P0ziidX/58347351904.pdf
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/c3f12811b09a.pdf
    • http://jikusofare.mywebcommunity.org/sonda_vesical_suprapubica.pdf
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/kajefafolu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zumojuluru.epizy.com/71632364971.pdf
    • http://zizajurowetomej.epizy.com/anualidades_ordinarias_y_anticipadas.pdf
    • http://fipojeraxuw.epizy.com/sajemozikitomebenifate.pdf
    • http://zumaxupuvu.epizy.com/gesirebisadupeju.pdf
    • http://lidiwerefibe.rf.gd/autocad_map_3d_2016_free.pdf
    • http://wikatefa.epizy.com/72058825152.pdf
    • http://bapexuzajo.epizy.com/lewaladapiwarutajibikira.pdf
    • http://baruluzibovog.epizy.com/2012_hyundai_sonata_hybrid_battery_discharge_warning.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_off0000f1e7.bin
53a03bee025c750db9bf6c38a6cb68ed938371e913474c5d3e3e2a80a5a1c29c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 5900 bytes
font_01_sfnt_off000105d2.bin
7b4b9a52f519fed43cef93b53b96bef0071a82b98118e2c39a469be8b46c395e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 11712 bytes

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