Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd46bf392556777b…

MALICIOUS

PDF

73.3 KB Created: 2021-03-02 23:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fa8a1038759eacc4f3eb47b8ef20d652 SHA-1: d90ebbf42925368f540da8584fe750144445f792 SHA-256: cd46bf392556777b104e91b9927d2dda0e4d999969875e45751120d4b62a94d4
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to redirector infrastructure, including 'https://dafemum.ru/strik?utm_term=ar+grade+level+equivalent', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational equivalency, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://dafemum.ru/strik?utm_term=ar+grade+level+equivalent In PDF document text
    • http://circleshtang.xyz/sigmund_freud_civilization_and_its_discontents_analysisd9phw.pdfIn PDF document text
    • http://puxeguka.iblogger.org/lemuwigo.pdfIn PDF document text
    • http://fegoxedivex.iblogger.org/chrome_apk_for_android_4._4_2.pdfIn PDF document text
    • https://dawosovakix.weebly.com/uploads/1/3/6/0/136097295/9269245.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/5905936.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/14407a9310a.pdfIn PDF document text
    • http://itdiscount.info/polaris_sportsman_400_carb_removallsldo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxodisesi.rf.gd/96677265934.pdfIn PDF document text
    • http://tubulufegufixo.rf.gd/frontier_netflix_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/bawim.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/rofifoxetozij.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/molixis.pdfIn PDF document text
    • http://fodiwivovekuvut.epizy.com/pitogiges.pdfIn PDF document text
    • http://ruwukag.epizy.com/crbsi_guideline_idsa.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/38284165687.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_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 4988 bytes
SHA-256: 77b48d0c256356573b1678784557cccf8414bbcd5fc4b306bb02485f4820a7b7
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 10032 bytes
SHA-256: 36d4979bf23b724d58ef4c7be0c32b21770f14bc5398b1d60acbb5fefeb83ff2

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