Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5efdc0e1c511a4f…

MALICIOUS

PDF

90.5 KB Created: 2021-03-24 16:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f1687b15c6ed17de92ad46d7b80dd00a SHA-1: 7936d1b27ec20acd3dbff3803a13cf771ef4aa9a SHA-256: f5efdc0e1c511a4fd1630a4dd54cdaeebf4589619b653d26e507e0af7ab6c562
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains keywords related to 'whirlpool washing machine instruction manual' and the authoring application 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of external URIs and a high ML classifier score strongly suggest malicious activity, likely related to phishing or driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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/aws?utm_term=whirlpool+washing+machine+instruction+manual PDF link annotation
    • http://fumuponi.22web.org/autodesk_inventor_2016_student_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd262ab263b3.pdfIn PDF document text
    • https://gedepaxu.weebly.com/uploads/1/3/1/3/131378821/woderik-fajaz-xizaxalolinage.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/xivixuwitazude_bugagi_xaruveferap.pdfIn PDF document text
    • http://fawaxifiwuzodil.scienceontheweb.net/succeed_in_ielts_speaking_and_vocabulary_vk.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/pubipodixo.pdfIn PDF document text
    • https://noloturajikule.weebly.com/uploads/1/3/4/4/134486045/ea451ba9.pdfIn PDF document text
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/kelugikixoso.pdfIn PDF document text
    • https://zorajifedimak.weebly.com/uploads/1/3/1/4/131437130/tufuwe-wavozorotazij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_6007621b59844.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/bab6b7e52276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_6033980171bf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_604a05bd94297.pdfIn PDF document text
    • https://wakapulexo.weebly.com/uploads/1/3/3/9/133997174/eb17be335.pdfIn PDF document text
    • https://liluwovadig.weebly.com/uploads/1/3/3/9/133999138/d25d2297d58468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/dewalt_18v_battery_in_14.4_v_tool.pdfIn PDF document text
    • http://tenowuwewid.epizy.com/vehicle_sale_agreement_format_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/telugu_movie_badrinath_film.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/collage_maker_pic_grid_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/jorinadifominenisizez.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/what_are_german_reflexive_verbs.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/anydesk__apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 5332 bytes
SHA-256: cdca1d1126beb3a21703aef4beeb8e5a0593b525cc2b4fbd9a1bff9674996674
font_01_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 10840 bytes
SHA-256: 5da8c20e9d9ffdf76b7cb5a8e7c6461ba5333f1f67fd1911e4463bdf582e8f4b
font_02_sfnt_off000138f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F5 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b
font_03_sfnt_off00014e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E05 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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