Malicious PDF — malware analysis report

Static analysis result for SHA-256 80496fd36d3258dc…

MALICIOUS

PDF

78.7 KB Created: 2021-03-05 11:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5e3a228d4d49695722dd5e8cbc1c751b SHA-1: 39aeb25923257c3c140dae59b123d369987d9f67 SHA-256: 80496fd36d3258dcf940ad1de802e1476e2c13d79a8e2076880468adc4f80d51
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to medical treatment. The presence of multiple disposable domains and link farms indicates a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=how+to+recover+from+scoliosis+without+surgery In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fe644ea22ea2.pdfIn PDF document text
    • http://a-trvl.ru/7464899306ymdux.pdfIn PDF document text
    • https://xevuradapo.weebly.com/uploads/1/3/3/9/133986258/2750170.pdfIn PDF document text
    • http://websecurer.tech/how_to_replace_ge_dryer_timer_knobc50qv.pdfIn PDF document text
    • https://gazikurow.weebly.com/uploads/1/3/1/4/131452893/5525485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421478/normal_5fe930ec4f91f.pdfIn PDF document text
    • http://opros.xyz/mimabels4pxg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_5fcc0c37e75ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5fd05a099c038.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/61a5fa592b.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/95597008168.pdfIn PDF document text
    • https://jezasozogederek.weebly.com/uploads/1/3/5/9/135960593/32ebd.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/8348860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_600447de10323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/chemistry_for_dummies_online.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/the_merchant_of_venice_bassanio_character_analysis.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_2978e579e5794f7fb14e2d2d9a0ea694.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_bb229ecb8ded4501835810b1cea9a895.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_d4c81dcc4ef14414a31d61f880155ceb.pdf?index=trueIn PDF document text
    • http://pupagerirawax.myartsonline.com/what_is_facebook_unique_id.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/inferno_dante_summary.pdfIn PDF document text
    • http://vizokipinebawik.rf.gd/funny_journal_prompts_for_adults.pdfIn PDF document text
    • http://dikawuferiwa.rf.gd/salaja.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_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 5300 bytes
SHA-256: 5bd36e83b9079f7288af017b059944ade589d0006c0cc3de4bf0a9fe1080b1e2
font_01_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 10288 bytes
SHA-256: 6c1570fdf13b867b89ef1eb1ba73be8c6f4cdd50bb8866516f5040c17488406e