Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd954e7e567f4b1…

MALICIOUS

PDF

86.0 KB Created: 2021-04-03 01:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178a224846588c54dfa1e02fa74b6a79 SHA-1: 29a344155ffd67817337fd95f12b35f599b45acc SHA-256: afd954e7e567f4b1232ad743a0ac8695c8420c615a97e4d6068f1899002882e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to dynamically generated SEO-like pages, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=rival+ice+cream+maker+6+quart+instructions
    • http://kewisanoxiv.66ghz.com/marketing_concepts_book.pdf
    • http://jegepev.22web.org/all_herbs_and_spices.pdf
    • http://jujuwana.iblogger.org/85277416287.pdf
    • https://cdn.sqhk.co/vakolitakap/gpggOGj/25733159981.pdf
    • https://digakope.weebly.com/uploads/1/3/5/9/135974251/natijopiji_ruruv_noxikutezofete.pdf
    • http://coolmag.biz/96370216483wvzp5.pdf
    • http://begdas.fun/xapazezodakefuwopuzotobp4p18.pdf
    • https://wilibuluso.weebly.com/uploads/1/3/6/0/136086636/3721553.pdf
    • https://cdn.sqhk.co/xelajuwodaf/hiCjdxV/halloween_sugar_rush.pdf
    • http://jesipuvapuse.iblogger.org/12717396031.pdf
    • https://cdn.sqhk.co/dijabidasu/chfjjhc/fruit_shoot_fall_guys.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://simabox.epizy.com/1031868989.pdf
    • https://s3.amazonaws.com/gomakobez/faxadijixefama.pdf
    • http://ferefifadiziv.rf.gd/jopogawikiwokup.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/fuvewobiresoxobulubenof.pdf
    • https://s3.amazonaws.com/litunux/why_is_my_smoker_not_getting_hot_enough.pdf
    • http://wogurep.epizy.com/classify_triangles_worksheet_5th_grade.pdf
    • https://s3.amazonaws.com/jagux/holy_quran_english_version_download_for_android_mobile.pdf
    • https://s3.amazonaws.com/dukavunivifa/vexopetelugipexelivataz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010555.bin
049f9818863a5daf23063d41dcd4f5ec0303ba821884d6548a2c70e9e0ddaa6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 5236 bytes
font_01_sfnt_off00011714.bin
65b8e7fb9818befdce601795d16656e222578660e48a4b347102b38a7ab19db8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 10772 bytes
font_02_sfnt_off00013bfe.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFE 4324 bytes

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