Malicious PDF — malware analysis report

Static analysis result for SHA-256 1422aab2c2ddcc70…

MALICIOUS

PDF

47.0 KB Created: 2020-10-13 09:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dd30f949596decd112f2e68074438853 SHA-1: 26795d5aaafda0efd2afba94f421475e3ad21fab SHA-256: 1422aab2c2ddcc7004066aa2825a20c49a7b633b43d235c33c0ee33beaeaad7d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to disposable hosting services and are likely part of a link farm. One critical heuristic indicates that a PDF link points to known malicious redirector infrastructure. The document body, though malformed, contains text suggesting it is intended to appear as a worksheet, likely to deceive users into clicking the malicious links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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://gettraff.ru/strik?keyword=ancient+greece+map+worksheet+pdf In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/7922058.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ratot_muweliwamopoj.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vigirupiruwovilav.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tebavu_mofevuz_punoxibera_gijipomole.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/jibepare-vudaramuzi-refirezagulele.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.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://uploads.strikinglycdn.com/files/c4f81e6a-2425-44a9-99d6-187254c2aa6c/fomokativevedetikevupibig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48eae6d-8296-4ce8-82b0-8042c43429ad/6318252910.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_off00006b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B48 5472 bytes
SHA-256: 6755707f021929b29053ef6c5130c421d97a48bff68426ab3c9f41dd3301f773
font_01_sfnt_off00007dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBF 10252 bytes
SHA-256: dd251d0c2a14ea701bb7892395eb24eef1dc22b10c42986bc250e7790d6086f8
font_02_sfnt_off0000a0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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