Malicious PDF — malware analysis report

Static analysis result for SHA-256 b178497d703b780f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 15:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc3c766f68cece96892a92991e593103 SHA-1: 2069daab2c5bc1fe5c2e3879910a9604173c5953 SHA-256: b178497d703b780f491476d6a92da9332b1f8f8c49d06fbd781e0cd4edde4eb3
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of an SEO link farm. The primary lure appears to be 'Descargar juegos apk', suggesting a phishing or malware distribution attempt disguised as a game download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=descargar+juegos+apk In PDF document text
    • http://pestore.pro/luwagijasovidedmfd2r.pdfIn PDF document text
    • https://zejinimab.weebly.com/uploads/1/3/1/8/131856072/7629453.pdfIn PDF document text
    • http://bbflowers.net/pizovebmnqjd.pdfIn PDF document text
    • http://sberbank.link/how_to_prepare_for_12_board_exam2p9zl.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/giwazu-naditabawuwu-kodora.pdfIn PDF document text
    • http://mybestchan.online/50820341476if6pn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovopabipani.rf.gd/moana_cartoon_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/33281653212.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_443ff6f9b19e4886a0c6c148396ac6a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/71777650310.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/what_is_the_greatest_miracle_in_the_world_about.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_b9f4042b5a484e28a16909688f32415a.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_0dc24e966d864d8689910f20844136ac.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_ad46715f1c3a4028a8587b3374945d74.pdf?index=trueIn PDF document text
    • http://tidizovebimike.epizy.com/pazedojuvagutarinujof.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_d5969f0923ff4e36a7599068c840e280.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/83236062342.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/rogotajineser.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_07d5f89a6626433badb09a35663b5d35.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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 5208 bytes
SHA-256: b32ad3adfb833f719024edd0ef04abc846ad7bd3b7fa1cb1e5d02490d8fde1fd
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 3384 bytes
SHA-256: 4ee3c2ec40ec1a38c3a74e93f6cc42a2449f39e1ab4608a67962f03798c9c875
font_02_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 12496 bytes
SHA-256: 91c23d6cefbd5a167c71f8e4770e247f3ac8fa4089f85597b149bb32ba66e9b0