Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1495a40e9803970…

MALICIOUS

PDF

87.6 KB Created: 2021-03-16 04:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e9dba55c28db1356d525b68e966148ba SHA-1: baf3b6c11b87300cb2d7bfd3e83ba6e0257bb7c0 SHA-256: f1495a40e9803970bfa6ce7ba10ea04b09bddcffbe1275888b18a96f8fa32b53
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the presence of numerous external URLs suggests a redirection mechanism to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/wix?keyword=the+little+seagull+handbook+online+pdf+free PDF link annotation
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/1190381.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/JMhji6x/maxpreps_football_rankings_2020_georgia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455179/normal_602677ebc6617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_604e0926622e4.pdfIn PDF document text
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/wavomurozexadu-jojipofetob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_6049ae4b96729.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/lomeloxopivaxagifiv.pdfIn PDF document text
    • https://kipofazusaf.weebly.com/uploads/1/3/1/3/131379409/4f6b8ff8605353.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxovugefulo/OgdqEFS/54451348255.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/wobuf-xogida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_602b55e3550e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365652/normal_5fe1734dc80a6.pdfIn PDF document text
    • https://cdn.sqhk.co/fonowatusopu/hfXpS3q/wuvikopezejuxulijag.pdfIn PDF document text
    • https://cdn.sqhk.co/giboxikewev/eX7Ewj2/84952201545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_5ff8937034668.pdfIn PDF document text
    • https://volexerakonoza.weebly.com/uploads/1/3/4/7/134713377/1333547.pdfIn PDF document text
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/gedabudozopof.pdfIn PDF document text
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/22e38.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/jemupizu.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/fizup/dragon_age_inquisition_reaver_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/autodesk_dwg_trueview_2018_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/report_unstamped_mail_in_mailbox.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 5340 bytes
SHA-256: 96b93a51254bdb564a84ec4792996477b002bc2c77e21460e826404747d99083
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 2096 bytes
SHA-256: 7cd81da48aaa6dd7e8de027d154c3cac54cc15e3509c2da48772097502d580e5
font_02_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 16024 bytes
SHA-256: 6159082c78e871f9b61952701e3c06579a7983758e6148a868c6f9a6cf1760ee
font_03_sfnt_off00013fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e