Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbb353aa087b26d…

MALICIOUS

PDF

94.8 KB Created: 2021-03-21 12:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a67100f62400ceeb6c2fc11d4c3541bf SHA-1: 111ea768f0bc5d6aef71591f83cff0e8c331010f SHA-256: 9dbb353aa087b26d894d972e5f4c4297b656a53fa6e7273d2346aceb633e0fd6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/award?keyword=bandura+theory+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487419/normal_60111c099634f.pdfIn PDF document text
    • http://maderajapodap.iblogger.org/the_narrative_of_the_life_of_frederick_douglass_excerpt_from_chapter_1_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5ffa4556acc70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_5fdc6dddd9ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_60515a6a0f613.pdfIn PDF document text
    • http://sevelorovuwo.66ghz.com/gabozu.pdfIn PDF document text
    • http://pidawiwosoda.iblogger.org/39887287906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_602499ef24fff.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/autocad_lt_2015_iso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gobusef.rf.gd/kisaxowisofepemabipuk.pdfIn PDF document text
    • http://madojizekikozor.epizy.com/godanawelosiribunilepiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa221b9-7480-42f5-8a46-da52b182e8b4/what_is_the_meaning_behind_the_chickens_come_home_to_roost.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_616f25b29ce04ffeb421da21a7eb4df7.pdf?index=trueIn PDF document text
    • http://fiverulaw.rf.gd/nidekomedezolomaxatedoze.pdfIn PDF document text
    • http://loluwoje.epizy.com/50925617456.pdfIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_ca18e8c94a0a467a8f42dbb1968f82b2.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_7b1d032cdb504c1f9ba4aa551b8369c5.pdf?index=trueIn PDF document text
    • http://votaxikotoris.epizy.com/gelesolivumofepedofug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2c61af-4476-4fb0-91ce-6de287262065/braun_thermoscan_lens_filters_-_40ct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8131bd76-29b8-448c-9099-e0c8a7bc66ef/61938304589.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_off000131b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B1 5068 bytes
SHA-256: 6ed196716d860cfb46f942d40edd3aaac6fd3f0090d34c2df8435028a711513e
font_01_sfnt_off000142f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F9 12368 bytes
SHA-256: 6f3ca61db7fdf23f903016d1c1a8449cdcd6ae1dab5dbeaaa7f3636e23908721

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