Malicious PDF — malware analysis report

Static analysis result for SHA-256 640735bf9d41c5a3…

MALICIOUS

PDF

88.1 KB Created: 2021-02-24 11:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf954532243c99019f0a5c0f298e6199 SHA-1: 4540c270ff24ee07a67ea18699b2f993df93e162 SHA-256: 640735bf9d41c5a327ebeb8e17c20eef9a6eadc0675a784e0de9f82cbc1c9e18
116 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains an external URI and a callback phishing lure, suggesting the user is prompted to call a number for a fraudulent purpose. While no scripts were extracted, the presence of an embedded URL and the phishing lure strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/strik?utm_term=baxi+combi+boiler+how+to+turn+heating+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416934/normal_602b68f81ebf9.pdfIn PDF document text
    • http://fegekeketed.22web.org/absite_surgery_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5fca77db71c37.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
    • http://pazipinabobon.epizy.com/word_meaning_book.pdfIn PDF document text
    • http://jopasimu.rf.gd/rudilonalunonolidowobojo.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/greenhouse_gas_emissions_by_country_2017.pdfIn PDF document text
    • http://setixebasedi.epizy.com/60977399380.pdfIn PDF document text
    • http://jitemawuvefogox.epizy.com/92728471082.pdfIn PDF document text
    • http://pobipegosaba.epizy.com/antonius_cleveland_scouting_report.pdfIn PDF document text
    • http://sekizipax.rf.gd/what_is_shinigami_in_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/fipexarisusogux.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/93877616908.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/48453123668.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/79439439523.pdfIn PDF document text
    • http://zubeleboju.epizy.com/81152788126.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/ark_saddle_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/wwe_smackdown_vs_raw_2011_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/finest_girl_bin_laden_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/biodata_form_philippines_free.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_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 5264 bytes
SHA-256: a7f578d60b6cdcdd6580f2b6f137d9242e53d4ed1e350fa21a0060431e27ccaa
font_01_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 11244 bytes
SHA-256: c0d19ef6641d08f25e105c31aab501560e0ad9e079b09a4509f795e31db8062d
font_02_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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