Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91baa98fbedb759…

MALICIOUS

PDF

75.4 KB Created: 2021-03-13 15:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b99c69652960dbf7631475b01394bc94 SHA-1: 1a9dfcf696ba264878086f8fbdb8d2986a7afadc SHA-256: d91baa98fbedb75931461da6df14ece0e7eac7a79028641ba4729039b08262a8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://golowaki.ru/123?utm_term=solitaire++for+windows+8.+1 PDF link annotation
    • https://vebupefipi.weebly.com/uploads/1/3/4/4/134497137/2487793.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/hfKOhjF/lutikolor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5fe556fd7cc57.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/8015676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_60316905b23d6.pdfIn PDF document text
    • https://cdn.sqhk.co/kewexezaviz/Xvjijgs/mannequin_head_3d_model_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/fuGnqfX/bisoweruwepa.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/gfjd94g/sibugenuxerevifabemopefu.pdfIn PDF document text
    • https://felabare.weebly.com/uploads/1/3/0/7/130776415/1222cddbf.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/t5mibgd/23281063017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_5fd19e9fbb586.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/gFsjaK6/aula_de_ingles_2_bully_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5fda0b7089538.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/iiieGid/kid_city_hello_neighbor_act_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_6048cc1bb04ad.pdfIn PDF document text
    • https://cdn.sqhk.co/bubesuzax/cv3gijc/wifimasevijevox.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/mZCHjha/monster_bingo_game_instructions.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/4063674.pdfIn PDF document text
    • https://cdn.sqhk.co/mozejipakas/OieihbI/29421961696.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/PieEvhj/identity_v_hunter_tier_list_maker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d10a69f-6579-4c2d-b0aa-1896e0b8e576/lorerata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b7cf45-d235-4706-ac05-8d26b498a8ab/38092281290.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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 5376 bytes
SHA-256: 9eb2a1ee62dc64cac788f3f4daa8208ca965bb5a347ca753fd0038325b402d22
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 10908 bytes
SHA-256: 66b16a79ac0f1ce2470c0105009c16a7d218d14775bcb1976adcf906def13704

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