Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa081ec235f7bfa2…

MALICIOUS

PDF

77.9 KB Created: 2021-04-05 06:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 524995018060d0cd550a25bab4e7951a SHA-1: 9c3568ad42fd7b174770939f7ae460202db2cf65 SHA-256: aa081ec235f7bfa225ea4c9f8b50969c82e05cce9668ca37b46f6127090ff32f
134 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and forming a link farm, suggests a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using numerous links on disposable hosting to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=pharmaceutical+aerosols+ppt PDF link annotation
    • http://se-mrush.com/46404662651ph54h.pdfIn PDF document text
    • http://nalapagized.22web.org/video_cutter_apk_old_version.pdfIn PDF document text
    • http://bidurevemoj.22web.org/bujakagaxi.pdfIn PDF document text
    • http://murupewobot.iblogger.org/atomic_habits_james_clear_podcast.pdfIn PDF document text
    • http://fiteduwad.22web.org/christmas_coloring_sheet_for_toddlers.pdfIn PDF document text
    • http://laitlabs.pro/keys_backyard_spa_instructionsy20zg.pdfIn PDF document text
    • http://bbflowers.net/buscar_mi_iphone_androidsmlll.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/jejes9H/rocky_rampage_wreck_em_up_apk.pdfIn PDF document text
    • http://insuranceautousa.com/gewavegezugemepabedonu0n10h.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/iqhaK3b/jamizezetomosufe.pdfIn PDF document text
    • https://cdn.sqhk.co/boxoveru/nibibgw/selenium_music_player_premium_apk.pdfIn PDF document text
    • http://zekoselu.22web.org/3542043078.pdfIn PDF document text
    • http://vufilulojusabid.iblogger.org/79895250627.pdfIn PDF document text
    • http://begiguvok.iblogger.org/la_metamorfosis_franz_kafka_frases.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexidolovosope.rf.gd/25776639098.pdfIn PDF document text
    • http://naxufiregukorer.rf.gd/how_to_connect_ihip_wireless_soundpods.pdfIn PDF document text
    • http://pakurowomeki.rf.gd/50809225324.pdfIn PDF document text
    • http://dewonodifo.rf.gd/lenovo_thinkpad_t430_ram_slots.pdfIn PDF document text
    • http://fumilojejukuro.rf.gd/kezudobixiseganigimuvuxup.pdfIn PDF document text
    • http://pozidatizoza.rf.gd/auguste_comte_contribution_to_sociology.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/calvin_klein_platform_shoes_sneakers.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/7528518148.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_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 5176 bytes
SHA-256: 195181ca1174c424276616b22ca67498be49f6492832a195f8359efcafd335a0
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 11440 bytes
SHA-256: 39d6bf7f005cd71fb6e3ac82349ad33578d4d5d040459fa5a8d42f2baf763056

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