Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7583ba1e792c522…

MALICIOUS

PDF

64.8 KB Created: 2021-01-11 20:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0b0a5fe16b779eed6c6868c2b0db2219 SHA-1: efb08df0bd794345ff55fbc42ca8928557f3cf89 SHA-256: a7583ba1e792c5229c6581ee7f2b2ccf06d18810b5163b814f5a3de803fef36c
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure suggests it functions as a link farm designed to lure users to potentially harmful websites, possibly for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://traffmen.ru/123?utm_term=standard+heats+of+formation+worksheet+answers In PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/2041871.pdfIn PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/wudezojivibabexinikibe.pdfIn PDF document text
    • https://site-1174800.mozfiles.com/files/1174800/99226857399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5fd7961ce0ef0.pdfIn PDF document text
    • https://site-1172756.mozfiles.com/files/1172756/off_the_road_free_shipping.pdfIn PDF document text
    • https://site-1174422.mozfiles.com/files/1174422/10948709121.pdfIn PDF document text
    • https://jodakinikap.weebly.com/uploads/1/3/4/3/134375895/mepolimoripujus_fazuru_muparopumimuge_teden.pdfIn PDF document text
    • https://lizapomed.weebly.com/uploads/1/3/4/5/134511268/b8e6c68ae.pdfIn PDF document text
    • https://fawofasoz.weebly.com/uploads/1/3/1/4/131454040/35e84a8585a43c.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/8873547.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/xokebore/cheerleader_song_mr_jatt.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_off0000b488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB488 5160 bytes
SHA-256: 681a4257cadea7f6d1878ee383025bd1aa5dc467a318b0d4ebf054215bd9ffa6
font_01_sfnt_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 10188 bytes
SHA-256: 6a1a4b9e9bce0addbecb8d30d6c8fb342eea30167eb8f0aa398550607e44687d
font_02_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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