Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84d57a703804916…

MALICIOUS

PDF

42.3 KB Created: 2020-03-11 15:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 6a0e89e6b012dfa208309bab98bc4790 SHA-1: 26008792c34d438638e613683fd228d5f9ad8046 SHA-256: c84d57a70380491606b53062c6180cb6dab16eea22b7a574838860abcecd51fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified as a PDF SEO link farm. The primary lure appears to be related to medical information, specifically 'Aspiration pneumonia due to gerd icd 10'. The embedded links likely lead to further malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://sgmtrack.com/uploads/1/3/0/5/130551257/130551257.html#aspiration+pneumonia+due+to+gerd+icd+10 PDF link annotation
    • http://airductcleaningkensington.com/uploads/1/3/0/5/130545493/jopugojen.pdfIn PDF document text
    • http://www.doughbunstho.com/uploads/1/3/0/4/130476047/sulebenob.pdfIn PDF document text
    • http://www.artbeatentertainment.com/uploads/1/3/0/2/130289669/3865795.pdfIn PDF document text
    • http://kofc11415.org/uploads/1/3/0/2/130288514/4885361.pdfIn PDF document text
    • http://ts.paaap.org/uploads/1/3/0/6/130621248/2044960.pdfIn PDF document text
    • http://ipfail.net/uploads/1/3/0/5/130551248/1942236.pdfIn PDF document text
    • http://landmarkenglish.opole.pl/uploads/1/3/0/6/130621143/9f875bddb583.pdfIn PDF document text
    • http://girishchavan.net/uploads/1/3/0/7/130776514/1e61c8.pdfIn PDF document text
    • http://playhousewestartsfoundation.org/uploads/1/3/0/5/130538866/807686.pdfIn PDF document text
    • http://adsl-64-216-162-83.suesmithvacations.com/uploads/1/3/0/5/130589078/wawebomob-wanaw-biteduba-jigenipigazar.pdfIn PDF document text
    • http://down-the-block.com/uploads/1/3/0/4/130436307/tobise.pdfIn PDF document text
    • http://advocateproject.org/uploads/1/3/0/7/130740461/8699932.pdfIn PDF document text
    • http://achomecleaningservices.com/uploads/1/3/0/6/130603884/kowalubowifoviw.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: advocateproject.org 4 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C8 8152 bytes
SHA-256: 6d6936be7890bb7f2275396baef9af57c5a03be95b70795fdd8b0dd21a31d137
font_01_sfnt_off00008443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8443 16300 bytes
SHA-256: 5984ec2c0f2f41b99da807731a813b6731fa766a433fe81b768481ad5b29c754