Malicious PDF — malware analysis report

Static analysis result for SHA-256 a070f9dcacf4180f…

MALICIOUS

PDF

87.2 KB Created: 2021-02-27 08:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d146df0f022a79402e94faa173d3cf29 SHA-1: 94b7fd13c49420e057ecfcc8ce7edeb3a79d53ab SHA-256: a070f9dcacf4180f622198fa9ea6b5b4a8c5b6e4331c46c19b141c31ccbae8fd
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, characteristic of a link farm, with one URL specifically mentioning a printer driver download. ClamAV and ML classifiers have identified this PDF as malicious, likely a phishing or trojan distribution attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=hp+laserjet+3050+printer+driver+for+windows+10+32+bit
    • http://kopuvimu.scienceontheweb.net/vita_spa_hot_tub_near_me.pdf
    • https://cdn.sqhk.co/rujoremebi/jhcTWje/23160143237.pdf
    • https://cdn.sqhk.co/suxepemup/4igHYhe/throne_rush_apk_hack_download_android.pdf
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/gurejiwiwarokokorugu.pdf
    • https://cdn.sqhk.co/tefozakozup/xy80Ejc/rosikod.pdf
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe6dbc5a340f.pdf
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fd199ec923fc.pdf
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcc16d5226b1.pdf
    • https://cdn-cms.f-static.net/uploads/4392867/normal_6016e41501406.pdf
    • https://kigumafu.weebly.com/uploads/1/3/4/1/134131380/vijafet.pdf
    • http://zatoxuvisovapuf.sportsontheweb.net/black_and_decker_20v_max_cordless_drill_driver.pdf
    • https://cdn.sqhk.co/fujonexa/t6ibhbH/35180705031.pdf
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/beruwixafumonoba.pdf
    • http://kovuzaxaf.medianewsonline.com/ditegufatane.pdf
    • https://cdn.sqhk.co/bupabumo/AjfSgg5/descargar_simple_mobile_my_account.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gulopajekojof.epizy.com/mapif.pdf
    • http://rojanesifilagu.myartsonline.com/58259049242.pdf
    • https://s3.amazonaws.com/satuja/project_finance_tracker_template_excel.pdf
    • https://s3.amazonaws.com/paropabaru/memixalezubupawujimeso.pdf
    • http://rukitugelonodov.rf.gd/planet_coaster_prestige_guide.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_off0001158f.bin
fcf5d5bf919452631c2087156f2869e068eef9a109ccac918937025f0edce5bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 5980 bytes
font_01_sfnt_off00012a0e.bin
938960fb35c6b7f82cad5c91933e91aa3dc05165883ec00017cdbf5a9e228852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 10692 bytes

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