Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc5f5d6731e98c4…

MALICIOUS

PDF

107.8 KB Created: 2021-02-20 21:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a1a5befad1db4d91c852bce1c11b0aaf SHA-1: 238d182e7676b1acf4e054a318198ced67c9e278 SHA-256: fcc5f5d6731e98c4a61ad524420e3516a5fafba312dd9a5d783c629d4b56f534
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of embedded URLs, many pointing to disposable hosting or redirector infrastructure, designed to lead users to malicious content. The primary malicious URL identified is https://yafferge.ru/123?utm_term=introduction+to+finite+element+analysis+and+design+solution+manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://yafferge.ru/123?utm_term=introduction+to+finite+element+analysis+and+design+solution+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4479213/normal_600d279e0b020.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/9779442.pdfIn PDF document text
    • https://daxajofu.weebly.com/uploads/1/3/0/7/130740026/rewafepubaxuli.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/hijatgh/juego_de_tank._io_online.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/hcjji8I/homemade_ice_cream_recipe_without_heavy_whipping_cream.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/napewabebowovumujewe.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/xogasamizibogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fda6e2ee8e43.pdfIn PDF document text
    • http://2gusevshop.space/8691299675kjxtg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fe7788156877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5fed342fe7625.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/iwCjQeZ/kit_dream_league_soccer_liverpool_2019_20.pdfIn PDF document text
    • http://goldstein.capital/denarixagevetoturubpkdzz.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/50_shades_of_grey_streaming_freeosbe8.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/bjjjbji/53451992324.pdfIn PDF document text
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/wosirodukepeb.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/zanobadigir.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn 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/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 10372 bytes
SHA-256: 1ac738a81a0ca79f3aafc2e48ad68ba98dce9ed6895ec6cfaaca12654531650c
font_01_sfnt_off0001538c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538C 5380 bytes
SHA-256: 9a6c1c2750f428dff7172bc447bfc40b4a9e0c2f42eb492d2e9fb903762141db
font_02_sfnt_off000165d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D0 8976 bytes
SHA-256: 5f07b96a345167f8d597a4b3e1fe0e52dd7a62508af6f8e7b00de7561a89dfc4
font_03_sfnt_off00017793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17793 12116 bytes
SHA-256: bc1baf14c8c35b93a8c18f1421aa0487b7ae3545a1972f5a9b4d465a764e1267

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