Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52866e1f063dbd3…

MALICIOUS

PDF

96.3 KB Created: 2021-01-12 21:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c775a91e29c18b33e8bd6dbbd675ea5f SHA-1: 7a1908e8d76d15e12eb3351f9237b1a25b47a3a1 SHA-256: f52866e1f063dbd36be94c83ae506b5dab0f3581870f31ad6964877093ea9cf6
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least two pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to product reviews and application details, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/123?utm_term=lenovo+flex+14+costco+review In PDF document text
    • https://cdn.sqhk.co/bovokolel/N0AyLjg/levomuxiwezapenewijuluvet.pdfIn PDF document text
    • https://site-1178643.mozfiles.com/files/1178643/kawopokubulibazutazed.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/hjajhVV/53788258960.pdfIn PDF document text
    • https://repumuwijuruto.weebly.com/uploads/1/3/4/4/134469056/6361f167b.pdfIn PDF document text
    • https://someradajisifu.weebly.com/uploads/1/3/4/6/134669983/5732290.pdfIn PDF document text
    • https://nipogoloduvi.weebly.com/uploads/1/3/4/3/134368022/sumizetosoxavok_kominovipujodu_tujeputinu_botovebabutos.pdfIn PDF document text
    • https://site-1171112.mozfiles.com/files/1171112/huawei_health_ios_apk.pdfIn PDF document text
    • https://xalogajufuzuk.weebly.com/uploads/1/3/4/8/134885017/nekisibisafipumot.pdfIn PDF document text
    • https://rarasaxemog.weebly.com/uploads/1/3/4/6/134611000/189806730d0aa83.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/jizjhrD/froberg_s_farm_in_alvin_tx.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/rezugekolaba/xexelibumuzifikuzorajedeb.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/unblocked_games_skull_kid_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/88441395917.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/gana_harish_ambedkar_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/lutimofiliruludaxenerur.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 4968 bytes
SHA-256: be64d4b9bbb73b79be6df476ee8cff376cb4fd2f258f92da2f3f154d2795a2ce
font_01_sfnt_off00013143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13143 13960 bytes
SHA-256: 579f64c846c836b56f975081ceb14831298a4046e8261314e2d082cbb33bbd2f
font_02_sfnt_off00015ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA0 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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