Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99013c20032d727…

MALICIOUS

PDF

74.2 KB Created: 2021-01-08 15:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e94bd6a50cfd139ff53b9c1d74bdf516 SHA-1: ad557b1f322afc07f4f978596adf6844a2b15fcc SHA-256: a99013c20032d7274e7107c16546f06c660546eba7adf10265249340378487e0
184 Risk Score

Malware Insights

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

The PDF document contains lures related to invoices and callback phishing, suggesting a social engineering attempt. It includes an external URI pointing to 'trafftec.ru' and a link farm heuristic indicates a large number of external PDF links, with one pointing to 'jasevumoxemu.weebly.com'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafftec.ru/aws?utm_term=booking+reservation+letter+format PDF link annotation
    • https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/pagojop_fadolot.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/hgggegh/epic_conquest_mod_apk_max_level.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/6004342.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/gxXgjLD/zombie_hunter_d-_day_mod_apk.pdfIn PDF document text
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/jolododed.pdfIn PDF document text
    • https://popuvagilubasi.weebly.com/uploads/1/3/4/0/134018524/ee4681cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7eb37c0-9f38-46e4-917c-ae36de0c5989/business_organization_and_entry_strategies_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a6fa27-37fe-48c4-8670-c8d4e19e214a/kofezenexitazavuriwejed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e580d3e3-0ee0-413d-9659-5c127c40f5bd/adobe_illustrator_cc_2017_tutorials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9755b5ec-c85c-485f-9c4b-f7e10572422f/forest_avenue_elementary_school_montgomery_al.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80773cd6-e32e-4714-aaaa-35957ee2b324/10935776470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f8626b-dc12-4234-840b-8dfd38a71a4b/trucos_de_gta_4_xbox_360_gay_tony.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 5260 bytes
SHA-256: 23647ee97f4ab3ce4f260726eeacc349d0fd376648b5597e502cc2f9a2c3ebdb
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 6424 bytes
SHA-256: 7c1964180b94b6044d97d4f34636f3957a0aa2a5b80c4cb99119668ee87780a4
font_02_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 11204 bytes
SHA-256: 53592812a16040176975b08850052f53454d6255bc4219d853b53c3a7a21476a

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