Malicious PDF — malware analysis report

Static analysis result for SHA-256 550c88a6453df9e3…

MALICIOUS

PDF

78.6 KB Created: 2021-05-09 08:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5bb57857fcb96f0415c12963500478fb SHA-1: 2fcb6c85c5370fed4c461f9fc69f4b196ffb5744 SHA-256: 550c88a6453df9e34c8f5ad09a5cf0d2ec2f32d73f7f7afff237a8e693625354
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=walmart+black+friday+2020+times PDF link annotation
    • http://legko.travel/ragetagolejisofotobunom7age.pdfIn PDF document text
    • http://zagavogafewakud.iblogger.org/bsnl_stv_karnataka.pdfIn PDF document text
    • https://zunitaxipef.weebly.com/uploads/1/3/1/3/131398356/5125505.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/7EV3mMT/laburilamugezitofokoxi.pdfIn PDF document text
    • http://xexogafuko.22web.org/kawazawexivekafalalagimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479237/normal_5ffe924f8ad48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480753/normal_6006e35e33e7c.pdfIn PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/9483324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_600819c85dab9.pdfIn PDF document text
    • https://popajilosofov.weebly.com/uploads/1/3/0/7/130776408/rifadegesodof_sexezatexazel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_604e46ffd3383.pdfIn PDF document text
    • http://bluebadgeform.com/types_of_public_policy_analysis0tyub.pdfIn PDF document text
    • http://bukuxubujexa.22web.org/apache_spark_best_book.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/3497345.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/hijU9ii/54538942181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_fef0996b91fc492d92275c035b41b99f.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_f98f82993fa34b22811717bd739e00e5.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_648de860f934402c81ff2e007039bb27.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_963d52d617eb4b0ca980f1a5ccd31e59.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 5760 bytes
SHA-256: 807f75a7d5f0946ff7b9817f5cf73cf8050a9936e9ded8d4057b0aba58856cba
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 10984 bytes
SHA-256: 61f02c7ecc6ea791274b9944926f8da973a38f030b31a136f4662ca0687fe970

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