Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a89488c8d121ae4…

MALICIOUS

PDF

77.0 KB Created: 2020-12-31 04:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1ec6df98943e59938155490c4bea2b SHA-1: 1a1d8440cfc98096c464a373a1666e7a642738a3 SHA-256: 8a89488c8d121ae4d1ccbb9f13d73316d77dc975239cdbbd33d5af7845addfb7
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The embedded URLs, such as 'https://trafffe.ru/123?utm_term=greatest+salesman+in+the+world+scroll+1', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to redirect users to malicious content.

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://trafffe.ru/123?utm_term=greatest+salesman+in+the+world+scroll+1
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/navofiperapiko-jakofovufon-sejutisoduludo.pdf
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/8429147.pdf
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/2d8168bf2352.pdf
    • https://cdn.sqhk.co/womibakok/qJHiehg/carnival_city_moviesite.pdf
    • https://padorapa.weebly.com/uploads/1/3/4/4/134496521/276e503.pdf
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/kaneluvot.pdf
    • https://cdn.sqhk.co/nukuzulu/GIiamNj/branson_shows_september_2020.pdf
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/gupemepinap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mekonulegipero/6228515262.pdf
    • https://s3.amazonaws.com/dudigonifu/36525577436.pdf
    • https://s3.amazonaws.com/gogunabones/rapeforevitafitabavi.pdf
    • https://s3.amazonaws.com/rewepalazamiso/nutritional_guidelines_for_alcoholic_liver_disease.pdf
    • https://s3.amazonaws.com/buponuwebi/words_that_rhyme_with_glide.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/6905858293.pdf
    • https://s3.amazonaws.com/kosipefojaw/three_body_problem_physics.pdf
    • https://s3.amazonaws.com/wufujudisu/niwumuvoxifatozaniruz.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_off0000e342.bin
8422b82d75077c534bf670b75a095416a79466cbe9341e635b20fa99acfcb9fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 5144 bytes
font_01_sfnt_off0000f4a1.bin
03e490d36cc099e1cd1f8454fed15dd463502e6fbe5d99ce510ea1a1effe9ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 10548 bytes
font_02_sfnt_off000118ae.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 4324 bytes

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