Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c98d1ac55bb107…

MALICIOUS

PDF

73.1 KB Created: 2021-03-17 00:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac3ad8f54b1167a102f74d7eba6a4b7f SHA-1: 583414f6701ebe862e41bc8790e91dc1d96737b2 SHA-256: 31c98d1ac55bb1077e0fbbf71df4247529a6565f37c7f55b29f8ab38bed185a8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, many of which point to disposable hosting services, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to 'construction company profile pdf free download', which is likely a pretext to entice users to download the malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/award?keyword=construction+company+profile+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481280/normal_60119df8cfb57.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/naletefev-dojixonobibuvi-vovorapo.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/ighWhgd/pic_puzzle_game_in_java.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/abebdea.pdfIn PDF document text
    • https://dibarovufi.weebly.com/uploads/1/3/0/7/130776786/dabamur_liwugumovifaral_benap.pdfIn PDF document text
    • https://buseziji.weebly.com/uploads/1/3/1/3/131398529/2663456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_604ef8354679b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_600b00d9a9760.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/kajugilubifafipix.pdfIn PDF document text
    • https://cdn.sqhk.co/sapasimemo/jdjfwjh/48975407842.pdfIn PDF document text
    • https://tabikanopik.weebly.com/uploads/1/3/4/7/134705808/jufadejetine_dojexuguw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371258/normal_5fe3efd79dcf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6011c246287f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_600a55e97fb43.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/5100898.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/e1ceace0c482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454430/normal_5fecd4ee14e47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bivanud/hill_rom_bariatric_bed_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/merry_christmas_songs_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/aladdin_arabian_nights_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/answer_the_question_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/lenguaje_corporal_de_los_gatos_significado.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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 5400 bytes
SHA-256: 8ed7372e6fe44ff17be4d9639b2099faa0cc2728abbab3ab9f27c347ce0605c2
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10752 bytes
SHA-256: 84fd1d28ce3589cdc366757b86b5f97ca52ca4a9abb57240aaa34202512ec456

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