Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a4dafebbbf1b5b…

MALICIOUS

PDF

80.4 KB Created: 2021-03-27 22:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d4922ef358c90f926ef03e882dd34985 SHA-1: 53231f724bc3d6fe2112e3632e5c049de545296f SHA-256: 43a4dafebbbf1b5b69917ef8da9f8d4c8e473af85cebd38495bfbab83e95533a
186 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=linksys+e8350+setup+software PDF link annotation
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/23cd65ab6a5b.pdfIn PDF document text
    • https://sarodinejafa.weebly.com/uploads/1/3/4/7/134762654/zimevolajetev.pdfIn PDF document text
    • http://akvatehnika74.ru/volkswagen_vento_1994_manualtjcqj.pdfIn PDF document text
    • http://dnepr24.info/83950874615hmavb.pdfIn PDF document text
    • https://dilasakezonaxos.weebly.com/uploads/1/3/0/7/130775260/jegunuxa.pdfIn PDF document text
    • http://pagebake.com/sodudulutudifch.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/goxuvenepodimupifuj.pdfIn PDF document text
    • http://dfds.in/pawafuzumurobubekezawur5bwob.pdfIn PDF document text
    • https://nukukenodaxuw.weebly.com/uploads/1/3/1/3/131384044/702f67.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/refawe.pdfIn PDF document text
    • http://finansi-7.online/what_qualifies_for_pmp_experience0gtvw.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/xepojewip.pdfIn PDF document text
    • https://gesajapuso.weebly.com/uploads/1/3/4/8/134873290/bifufaman.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/sefabe/schma_de_l_appareil_gnital_fminin.pdfIn PDF document text
    • http://wewopok.epizy.com/how_to_read_your_dna_test_results.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_0ca0217eddd34c7b8ef7b82ff27e48ab.pdf?index=trueIn PDF document text
    • http://lexojowal.epizy.com/betternet_free_for_laptop.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_d5d02dcfa4b24a8e96f4edbbcccdd96e.pdf?index=trueIn PDF document text
    • http://tidefos.epizy.com/juselopekupotamu.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/ramadefi.pdfIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_c225575f11644363947d239bba052984.pdf?index=trueIn 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_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5568 bytes
SHA-256: f9f6699bdb4cdbf4bcd78c8914736897a61d2248a09b9a174d6e1e07edb58445
font_01_sfnt_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 11476 bytes
SHA-256: 0644c4c73c6e76e9fedd41f9eb7faea480119906ddc46f9bd8ea7f3ac6bbc191
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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