Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf71958da5d176c…

MALICIOUS

PDF

82.3 KB Created: 2021-02-28 01:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: dc78f2ddd5acbde5d4edd056a2e85e97 SHA-1: e4306bdff4a7f5fb3d0c0451f51c74ef79d4b227 SHA-256: ccf71958da5d176c30a05961898092c294c3e0e5f11c7108056fbaa4ee0854d9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or leading users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=wix+tutorial+blog PDF link annotation
    • https://cdn.sqhk.co/farosexuto/5F4BFGQ/21714100799.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/827587.pdfIn PDF document text
    • https://xajowaluvuro.weebly.com/uploads/1/3/5/3/135303047/womolozuditutagija.pdfIn PDF document text
    • http://citruss.space/fapeloloserifog48.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/fgcighh/install_srs_premium_sound.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/xavotupiso.pdfIn PDF document text
    • http://rukozhop-guide.com/appcrash_fixer_free4t9n9.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/hd9aDjh/donkey_kong_country_donkey_kong_wiki.pdfIn PDF document text
    • http://sun-italy.space/puvesafebulinal707d.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/ibwBic9/64954992411.pdfIn PDF document text
    • http://uablog.site/kindergarten_worksheets_counting_to_1006qux8.pdfIn PDF document text
    • http://decideyouself.fun/lopivexoratlfql.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/0ichflX/swing_states_map_associated_press.pdfIn PDF document text
    • https://minebetedobipas.weebly.com/uploads/1/3/2/6/132696067/9290405.pdfIn PDF document text
    • http://fullpisetc.ru/what_does_it_mean_when_you_squeeze_your_breast_and_milk_comes_outiv8e2.pdfIn PDF document text
    • http://gitilapen.66ghz.com/kevadub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/sample_meeting_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/usda_corn_crop_report.pdfIn PDF document text
    • http://resimibesogew.rf.gd/60340120512.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_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 4896 bytes
SHA-256: 5332eabc1d92022559c83c04c7c4c1951ab2eb9bf91e7882ec7db2a00e80d88e
font_01_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 10640 bytes
SHA-256: f0b37379857ffc0637a825be9979d7dfcc853873caa548a5587efdced7cd21b3

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