Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c3f618b84a4ae6…

MALICIOUS

PDF

76.9 KB Created: 2021-04-12 18:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 77d67f906aa054e6b296768b285c428e SHA-1: 8456f46ad276511cec28a492ff3f82d10ec2f6d1 SHA-256: 08c3f618b84a4ae65d1ea85d61d1fa55f628eb7a4d6bc942e55cb5e91281eac2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=what+is+the+best+countertop+microwave+to+buy PDF link annotation
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/44493752a53.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/textbook_of_biochemistry_for_medical_students_free_download.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/839720.pdfIn PDF document text
    • https://zutepojajobemo.weebly.com/uploads/1/3/1/4/131454264/7d1ea4cffb424.pdfIn PDF document text
    • https://tulejimukun.weebly.com/uploads/1/3/4/3/134399478/e933f0924b5711.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/java_tutorial_point_free.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/official_arduino_starter_kit_book.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/motorola_model_sbg6580-g228.pdfIn PDF document text
    • http://zumubexupon.22web.org/comparative_adjectives_exercises_beginners.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/4867357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_b666f17a797b41b2bd1828507fe51e81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/92497939289.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/96780334282.pdfIn PDF document text
    • http://denefarow.rf.gd/how_to_figure_out_average_time.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/78219403675.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/kamojijur.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/82326669380.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/how_much_salt_a_day_australia.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/vuwejozizanok.pdfIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_3d391c2ad29c453f8d19122a232fdaca.pdf?index=trueIn PDF document text
    • http://dulubuli.rf.gd/42759767788.pdfIn PDF document text
    • http://vawofirulev.myartsonline.com/43042294069.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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 5548 bytes
SHA-256: 21a60ab837aee0cc8bdd610f29afe8eeb38bd73b1d7287fc47880b34f49deb15
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10620 bytes
SHA-256: 315ac49d47a724d57c0fe4e2abb6137d23ffca6997dc0b3810c7dc386bb3c98a

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