Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffcb4ca7985755f…

MALICIOUS

PDF

77.7 KB Created: 2021-03-01 11:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ab4812431daca1ab1ba6773429adce02 SHA-1: 28dcc73fc009412091658646e4de0a909a26be6f SHA-256: cffcb4ca7985755fbed872e1080312d557b4e606890f85eb19fa065612edb0ea
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and link farms. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wix?keyword=code+talkers+book+online+for+free+pdf In PDF document text
    • http://warowusavi.mywebcommunity.org/76635019143.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/354c239376d0a.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/goroge-sunedi.pdfIn PDF document text
    • https://cdn.sqhk.co/moleselofa/ibrhaii/sarigijunuvitug.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/Pjh6jjd/57126755789.pdfIn PDF document text
    • http://detonic-romania.website/free_sport_icon_set3v3y8.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/c1327bde.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/enTjiid/time_management_definition_economics.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/best_convection_microwave_oven_in_india_2018.pdfIn PDF document text
    • http://ideaita.fun/aditya_birla_mutual_fund_fact_sheetxhqi9.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/9248632.pdfIn PDF document text
    • http://frukt.space/tekonsha_p3_brake_controller_manual9n1og.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/adobe_acrobat_dc_free_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/tejoxaluziduvasosugop.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/automation_direct_vfd_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/58780353973.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/44323923980.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/vce_to_converter_program.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/carbohydrates_types.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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 5144 bytes
SHA-256: d2bb51294fdbbc50e0be3e4f0faa73193a19a759edb2f03c7956e1b358324957
font_01_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 10420 bytes
SHA-256: 1accab8f37a878d38e80add0e939c740e4f425d86732423f3133cc79b8af2c43

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