Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3561ec5dc82989…

MALICIOUS

PDF

73.4 KB Created: 2021-04-07 18:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c382f37b49eec7c8c249f0de0c934895 SHA-1: b6170b5c2a1c8c05680aa586c273897d22801ffe SHA-256: 4f3561ec5dc829898a2213b27366f41d7b975356b96d32b44a763115981b9c62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one pointing to 'jottigo.ru', a domain flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links, likely to distribute malware or phish for credentials. Although no scripts were explicitly extracted, the presence of external links and the overall detection profile suggest it functions as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=cartoon+song++pagalworld PDF link annotation
    • https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/420352.pdfIn PDF document text
    • http://dezimazokuxulil.mygamesonline.org/tatemokapegenunufavusipo.pdfIn PDF document text
    • http://ipoteka.net/how_to_ignore_friends_in_classv6u3d.pdfIn PDF document text
    • https://kutobuxuvesoga.weebly.com/uploads/1/3/0/7/130740510/vezajufolopunoxufex.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/9231901326.pdfIn PDF document text
    • http://banki-internetowe.com/28037688487rdik7.pdfIn PDF document text
    • https://jivikusobule.weebly.com/uploads/1/3/5/3/135326696/802871.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/4882135.pdfIn PDF document text
    • http://tegor.xyz/how_long_to_study_for_fe_exam_civil5vjyx.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/fagoboda.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/gefifevudug-pixum-mepumebe-xigefokivur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/wejuvono/california_adventure_park_map.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/gsu_math_placement_test_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/76772293134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071a125c-4761-4e62-ae93-c0d3dad2f535/xutigenesegalefewu.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/affidavit_letter_for_immigration_marriage_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d0d223-156e-47b1-a339-84766ec0ff9e/alesis_dm6_nitro_electronic_drum_kit.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 5124 bytes
SHA-256: 9fcdd595b4c4e4242713c446abd4af621efeab8a6543f0881753f007f1c373e4
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 10560 bytes
SHA-256: d214a5b09a1e82e620ae5bb4c9c1727727b80ef261fe0a6969fffda2ee7e9113
font_02_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 5472 bytes
SHA-256: a7b74287cd663792db9d20b65d775e9c57dbd967b69db0e6243f353479742801

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