Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccccd39ae2d4cf94…

MALICIOUS

PDF

77.2 KB Created: 2021-02-25 17:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7f71fe9915dce3d1f9806f0bfa79e8d1 SHA-1: 82e4fb5e944ee7820892799d18814d237c1c8fdb SHA-256: ccccd39ae2d4cf949fc7ae51401fe0f545a76f274e2a4cdd19c82735163bda27
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 embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=principles+of+real+estate+1+pdf PDF link annotation
    • https://zisusanizapan.weebly.com/uploads/1/3/0/7/130775047/nozenuk-vegutorujar-tivire-dakamaz.pdfIn PDF document text
    • http://teachost.com/texopizujukapikufouu1xg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6014a6d9daf50.pdfIn PDF document text
    • http://faceit.su/fundamentals_of_nursing_7th_editionu2a5u.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/4937866.pdfIn PDF document text
    • http://leree4.club/odd_couple_tv_show_theme_song_lyricskthxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5ff00a497232c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_6030759c95d24.pdfIn PDF document text
    • http://ogranifruit.space/69180845801nt0bz.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/fivotevoserigodapa.pdfIn PDF document text
    • https://wirazalalotun.weebly.com/uploads/1/3/0/7/130776536/9015791.pdfIn PDF document text
    • https://werijininen.weebly.com/uploads/1/3/4/6/134635560/5110945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5fe55a53a6519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487906/normal_5ff5b11a12098.pdfIn PDF document text
    • http://ranking-se.com/9248964833615kis.pdfIn PDF document text
    • http://idealicait.website/vscode_could_not_intellicode_modelv4ohx.pdfIn PDF document text
    • http://hotita.fun/stick_fight_shadow_warrior_unblocked5c07x.pdfIn PDF document text
    • http://getallcreditscores.info/mikoruzezovisebazitwqpn7.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
    • https://s3.amazonaws.com/sowirutelevolur/fewikopuvoze.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_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 4988 bytes
SHA-256: a19d44b1007f02fb7ae9671fe124d3a69db724c03ee5df3397eeb2be6eb91de9
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 9916 bytes
SHA-256: f67f847f40d9424522414f0b764b936fdc4cdcd3fd4c78028f02b86737010897
font_02_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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