Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69e94a37f10d4a0…

MALICIOUS

PDF

78.7 KB Created: 2020-12-22 19:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4fc9409836c170e067bfd6bdcf55ea2 SHA-1: 7f7e613a27e98e01fdfbb5f74d164151702b4e6a SHA-256: e69e94a37f10d4a028d85e3b02ea262850762103b4a60819fb3a1dc3a75e8f0e
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to backing up phone data, which is likely a pretext for an advance-fee scam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ggtraff.ru/aws?utm_term=backup+android+phone+sms+to+computer
    • https://static.s123-cdn-static.com/uploads/4380392/normal_5fc76d3b5b5a7.pdf
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f8880c8d0755.pdf
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/vasulolu.pdf
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fb4f7ef9fbee.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdf
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fcafad52be5c.pdf
    • https://static.s123-cdn-static.com/uploads/4480893/normal_5fcbabcabedd0.pdf
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fa050863c466.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc52832a87939686423d266/t/5fcddb8c5177ea328ce486e2/1607326604561/stackable_washer_and_dryer_sets_home_depot.pdf
    • https://static1.squarespace.com/static/5fde95ce5b7bc966055f9f1c/t/5fdf2bcd459323513bdba190/1608461263290/74852137264.pdf
    • https://static1.squarespace.com/static/5fc578d79698b02c7f3f914e/t/5fd2007ceeaf2774ac923c33/1607598204375/dwarf_clicker_idle_games.pdf
    • https://uploads.strikinglycdn.com/files/bd748daf-d02e-450c-860d-54f4fecf5091/93010075366.pdf
    • https://s3.amazonaws.com/zetare/veterans_day_coloring_pages.pdf
    • https://static1.squarespace.com/static/5fc11f477848ba205d19dcca/t/5fc97a2ffbf8976b723ddb63/1607039535828/readability_learn_reading_comprehension.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_off0000e5e1.bin
85f48a939e5c96857fb8e1475dba40b45cf90b19257c7218fc5ec3acc92c5bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 5276 bytes
font_01_sfnt_off0000f794.bin
98a6fe231ddde8ce541518f8633633f041a3aa8f04329dde89acc04b09383121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 11212 bytes
font_02_sfnt_off00011dbe.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 4324 bytes

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