Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a9e545d2a9b50a…

MALICIOUS

PDF

72.1 KB Created: 2021-04-05 19:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cfafc7ee4940e2cbcb928bc8409f6f35 SHA-1: 21777802a27dd9bf8fc64d8722c5cb314f9bcef7 SHA-256: a7a9e545d2a9b50a99fb22be5741b12954e774cce0255873a3f9eb2900405274
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure for a calculator manual, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://botokaw.ru/wix?keyword=calculadora+casio+hr-8tm+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450898/normal_6011086a4e191.pdfIn PDF document text
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/7f4210.pdfIn PDF document text
    • https://rodusebit.weebly.com/uploads/1/3/0/8/130874039/tevopufetepinuf_nujezinodenanit_dumawabekidi.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/lord_of_the_flies_piggy_name_meaning.pdfIn PDF document text
    • http://silvanozito.online/18846554857lnk2c.pdfIn PDF document text
    • http://glasshookahcatering.com/catalogo_schneider_2019_perue80jn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5fcc5d3b483d6.pdfIn PDF document text
    • http://podarokinsta.online/counselling_skills_for_managers_kavita_singhgb1rl.pdfIn PDF document text
    • http://dekovag.mypressonline.com/buxojemovomuximigifamuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_60413d7da3ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5fdb6abf64aaa.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/81cc7f03.pdfIn PDF document text
    • http://tryplafond.xyz/congratulations_on_your_baby_templatemsxu4.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/big_alphabet_letters.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/61b5a73b1f0.pdfIn PDF document text
    • http://atlas-copco.su/esl_worksheets_for_weatherd2hwu.pdfIn PDF document text
    • http://raxewapikeb.mygamesonline.org/gidasav.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://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_f9e9d82f26794b2bba5b9b7f3ecb52a1.pdf?index=trueIn PDF document text
    • http://lopakesuzuw.atwebpages.com/32410060457.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_7c8364f55bfa41d09d7791d252141100.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/existentialism_is_a_humanism_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/xitopagovidejusod.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/83857186892.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_4fb9cd30c20f439f8d704a1e92a050ed.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_b2beeb63489744988725a366e6e70668.pdf?index=trueIn 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_off0000cd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD91 5192 bytes
SHA-256: 67b8d64e4104bd4a437d7e0230b6cfac381854bf05f8ec1466d6f84026eaee9f
font_01_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10660 bytes
SHA-256: 0e9fb45f0fda5b111db1e926654a8e1a47a411b39e35c59c7d85fd74345152e1
font_02_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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