Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31d5b30ade25c90…

MALICIOUS

PDF

80.1 KB Created: 2021-02-13 02:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 30647d6b5b0eb3a4f9cfed9e6cfe37ed SHA-1: bd212d5cff012f421b523dfe45b9975cce292d04 SHA-256: c31d5b30ade25c90db0d30e737a162e6862f2b75669c81e84c5ca07d5b751140
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The presence of a 'download' button lure and numerous embedded URLs, some pointing to disposable hosting, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL findings indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://crophysi.ru/wix?keyword=edi+enterprise+cargowise+manual In PDF document text
    • http://popubim.iblogger.org/one_day_meal_plan_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412170/normal_5fed82679d03f.pdfIn PDF document text
    • https://nawodovifuvobix.weebly.com/uploads/1/3/0/9/130969758/7334213.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/daxukavupisov-buturuliz-lotev.pdfIn PDF document text
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/jetamofosux_rogulo_pitunaxiriwen.pdfIn PDF document text
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/masusubexirojobuva.pdfIn PDF document text
    • https://famelugosa.weebly.com/uploads/1/3/0/8/130873944/gamus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemerimaxafup.rf.gd/wumigoratifa.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/85885860677.pdfIn PDF document text
    • http://vibufek.epizy.com/wisixekowinovisilo.pdfIn PDF document text
    • http://mibexaluji.epizy.com/xamarin_android_cameramanager.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/rozigodaworeri.pdfIn PDF document text
    • http://zutawatupasexap.rf.gd/85652078004.pdfIn PDF document text
    • http://zefinut.rf.gd/54916959066.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/wamezivuxonaxexi.pdfIn PDF document text
    • http://kodadus.epizy.com/57729026288.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 4772 bytes
SHA-256: ff2ddfaac2221614dfe1756e3c8729dbefc3ceeac46efb57c78102c3542e5363
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 5444 bytes
SHA-256: 1ba8d9e35d24271aac59cbe94682075e444ac333a61000e33a5e05c7dc7f1649
font_02_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 10324 bytes
SHA-256: 684f22c400af0d0832242642bab34039ab213f1de114f6296853b2bab61e249b

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