Malicious PDF — malware analysis report

Static analysis result for SHA-256 325b8a6f68ff99b0…

MALICIOUS

PDF

80.0 KB Created: 2021-05-20 02:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a9eb6062dab4a6258a2fa2fccf1b194e SHA-1: 230c23bb01edddb8e466d4e3d4233cb5557294db SHA-256: 325b8a6f68ff99b0093a4bc9d0b2a54793f7f6ac4145d0a8208cc32bd6d76ec0
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits multiple indicators of malicious activity, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics, suggesting it's part of a phishing or scam campaign. The embedded URLs point to redirectors that likely lead to malware or further phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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
  • 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://xajibur.ru/strik?utm_term=download+my+stupid+boss+full+movie PDF link annotation
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/letazumili-nifulojipito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_6019a563acf38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_6068e4e07f9f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_606b620805f49.pdfIn PDF document text
    • https://bufogepuvuzi.weebly.com/uploads/1/3/1/3/131381066/d6a2efdfd078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fcd2e65b05ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_60252aca3fe11.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/pisele_suruxobuwaji.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/lemefofutomapox/molar_mass_of_co2_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8df1e3-9b06-432f-92b2-135c0a46c05a/american_assassin_2_netflix_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2f4b75-9fd3-4aa2-bb3a-cf398d83ec45/merorod.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/the_republic_of_tea_detox_green_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/41948348167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58d3350-4062-4687-aebe-543ee65d3d2d/can_steelseries_headset_work_on_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6b7f23-a709-415a-a4cf-e9c7b4b3aeb2/formulas_geometricas_moleculares.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/vogapopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3784819c-3448-4b31-a05d-e37cf6ab52b6/ejemplo_de_guion_teatral_corto_para_nios_con_sus_partes.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/molecular_biology_ppt_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/29466627015.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/26086165188.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_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5368 bytes
SHA-256: 2b3e14375084b2e80b327835ed0c2bfbbbf4b30149d8d5d6ca055c3bc9391407
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 10752 bytes
SHA-256: 6d9c238f4f3f9cac0dc219ffa634a00710ca58b602762a53d282af96a77811b7
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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